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ON TH£ LOWER SILURIAN ^:iti t-V^-.: ws ^wffT&^ * /;^:'^aV..? i^m:'^: ?';;:-^yp3s8^^.f^ /A'''*" ?^ip 1^:* o f:- ''■'^l »', • A"' ■ •? >' '^V''-. ■■Sir' r^Ci^f k i !fiy. ;y",!''' S¥ ffV? ;«^.v . >■ ^«: ;-^~^^*-:>- '^;%s-.^^ *:i-*i ■■•*!*;? m>i iaKt'i ■# *^. *' SMITHSONIAN INSTITUTION. UNITED STATES NATIONAL MUSEUM. ON THE LOWER SILURIAN (TRENTON) FAUNA OF BAFFIN LAND. BY C'lIARLKS SCTirCTIERT, Annistdiit ('»riititi\ OifisiiiH i>/ Straliijrnphir Puleontoloyy. Prom tho Prnreodings of tlio tTnltod StatoH Natioiwl Miisonm, Vol, XXII, iwrps U.J- ITT (with PhiU's XII-XIV). [No. 1 192.] WASHINGTON: GOVEUNMKNT I'UINTINtl OKKU'E. 1900, jjLia ON THE LOWEK SILURIAN (TRENTON) JiAFl'lN LAND. FAUNA OF By Charles SciiiTcnEUT, AaainUmt Curator, hirinion of Striil'Kjraplilc I'aUontology. INTRODUCTION. In the Slimmer of 1S07, a number of men took advantapfe of the Sev- enth Peary Arctic Expedition to <'ruise in Arctic seas and to linntand fish in Baffin Land. The author had the pleasure of meeting these men while on board the steanier Hope, and Icarnetl that they intended to make a whale-boat trip to the head of Frobisher Bay. As many Lower Silurian fossils had been seen by Hall duriny his exploration of this bay, the author requested the IJatlin liand i)arty to search for fos- sils. On the subsequent return of tlie steamer Hope from North Green- land, it was a great surprise to tlnd that Messrs. .L N. Carpender, R. W. Porter, A. V. Shaw, A. II. White, and F. Vi. Goodridge, had made splendid collections of fossils during tlieir stay of but a few hours at Silliman's Fossil Mount, which is at the head of Frobisher Bay. These fossils are well preserved, and here, as is so often t'le case in Paleozoic faunas, the brachiopo«l si)ecimens predominate, .however, unlike other Trenton faunas, the Arctic mollusca usually pre^ rve the shell, and this is the more remarkable because all the fossils weather out of a bluish clay. The author's interest in and admiration for these well-preserved fossil forms from a rarely visited region was so great that he could not resist asking tlie loan of the various collections for the purpose of making them known to paleontologists. Mr. J. N. Carpen- der, of New Brunswick, New Jersey, who had the most extensive col- lection, with great liberality allowed the author to make a selection from these fossils for the U. S. National Museum. From him, there- fore, this Museum has received 54 species represented by 113 speci- mens. The next largest lots were gathered by Messrs. A. U. White and A. V. Shaw, and purchased for the Museum. Mr. F. G. Goodridge presented one of the finest trilobites found. Mr. R. W. Porter also made a good c(»llection, which he deposited in the American Museum Proceedings U. S. National Museum, Vol. XXII— No. 1 192. 143 is*j 144 ri!ini:i:iii\iis or riir ytrfoxu. ur'.s/^'.u. vol.. XXII of Natural History, and tlicso s|M'ciiii('ns wero kindly placed at tlie aiitiior'H tlispoHal lor study, by Prof. R. I*. W'hiftleld. To those n«ntlo nu'ii, tlMMcrorc. pal«'oiitoloj;y is indebted foi- reiiderinf; it possible to describe one of tlie best eolleetions of fossils made in Aretii' regions. With the aid of a camera lucida, Mr. I], O. Ulrieh, of Newport, Kentn«',ky, made the litjuics. which are accurate representations of the speci«'s. The aiitlior is further indebted to him for paleontologieal assistance, ami his various notes are ineorpiu'ated in this paper in their proper places. DESCRIPTION OK LOCALITIES. Frnhislier /.'«//. — Previous to ISHT, all that was known of the }j«<»logy of I'robisher Pay was incbuled in a few incidental notes by Charles VrantMs Hall.' His collections were ])artly studied by Mr. U. V. Stevens' and Pnd'. P. K. Kmerson.' Durinf; the months of Aufjust and September, 1801. Hall, in com- pany with Innuit men, women, and ciiildren, e\))lored, by means of whale boats, tin', greater i)art of Kiobisher Pay, whieh up to that time was believed by civilized man to be a strait. On this trip he was also {jreatly rejoiced to tind unmistakable evidence of Frobisher's visit of 15r><»-r»7. The book cited is interesting reading, and from it are taken the following notes regarding the geology of this Pay. Jones Vapt: — Hall "ascended a mountain in the rear of our encam])- ment. * • * On my way 1 observed a considerable (piantity of the stone I had noric^ed upon Iron Island, and 1 also saw many small pieces of limestone on the very summit about a thousand feet above the level of the sea."' This may be the locality which furnished the fossils from the Utica stage, described by Professor Emerson and listed beyond. (Jape Stfvenn. — This locality is nearly 100 miles farther inland than Cape Jones, and heie Hall on the top of a mountain ''found numerous shells and fossils, some of which [he| brought away.'''' This may be the locality furnishing the Trenton fossils described by Professor Kmerson and listed beyond. Sillimaii'n FoxsH Mount. — At this place fossils were tirst brought to Hall by the natives. At my left, across tlic river, was a ridjif of white, which I afterward n.-imeil Silli- inan's FobhII Mount ( thus named after Henjaiiiin Sillimaii, jr., of New Haven, Con- necticut. 'I'hi.s fo.ssi! mount I.'* on the west side of the termination of Frobislier Hay. It is in latitude •>;! 41 , loufjitudo tiS ,")(! ), and behind it the unbroken front of a line 'Arctic Keseandies and Life Anion'; the Ksi|uimaiix, New York, 1865. -Aiuer. .Iouni.,'i tion it is due broken limestoni^ and fossils. - Mr. 1{. W. Porter, w\w visited Silliman's Fossil Mount in August, 1897, described it to the writer as follows: On ii()ahi> S. S, lIoi'K, Septemhir IS, 1S07. ClIARI.KS SciiiciiKin', Ksq. My Dkak Siu: In aceordanco with your request, I take pleasure in handing to yon tho following notes on Sillinmn's Fossil Mount ( Hall's) of Froliisher Kay, liallin Land. They aro \ery meaj;er — the results of only a few hours' visit to this forma- tion, as I had intended to give tho plai'O a moro thorough search next year. Sillinian's Fossil Moiiiit lies at the head of Frobisher Hay, some II miles south of tho Jordan K'iver and about 1 niil(« from tide water. It lies eloso against tint mountains of Meta Incognita [a|iparontly uncouformalily], is about 1, OCX) yards long and IMO i'eot high (aneroid; not KlO feet, as given by Hall), general direction northwest and south- east. Tho fossils wore taken from the talus slojies, the lieil of tho brook llowiug at the baseof tho mount, in tho liinestono near tho summit, and on tho top itself. At its northern end there is a smaller mount of lessei- height. The mount forms a striking feature of the landscajie, and is comjtoscd of limestone, disintegrated to such an extent that the talus reaches nearly to tb<^ siunmit, which is very llat and composed of tho ledgo itself. This limestone ledge of nearly horizontal bo litiwIiliTH of ){liiriikl origin. Al ItM HoiilhuiiHtuni I'xtri'inil.v it in Jniiitnl to tlii< riiiiK<' ol' iMoiintniiiM riiniiiiiK pitr- allfl lo lli« iiioiint anil riHinu to ai'itiiileH of tVniii 500 to MIN) I'f)'!. lletw)M>n tlin mount anil iKilKlilioriiig iiioiititaiii mIiIc llow.ia kooiI-nI/ikiI lirook, ilowin^ nortliwanlly nml out into till- \alli-.v liiitwittM) thii I'll). A NKAll MKW OK SII.LIMAN'.-I KogSII. MoUNT. (I'liiitoKiiii'li lij- It. W, TortiT.) f(i'eatiM- anil I^nmit nioiintH. TloH hriiok liiiM |ii'iil)al>ly miiHi'il tint Hoparation of tln-HK two «|i>vatiiinH, anil liMH cari'iiMl a i|uiintily of flay ami linii'Htonu out into thn valluy I'or Mineral liiimli'i'il yarils. A rloHi' scrutiny of tins ailjaooiit mountain i'an;;ii rcvrali-il no limrittono foiiiiiition on itit Hidi-. Tim rorU of thin ran);o Ih a ilarl; niica-HcluHt, tliu ilipN maliin^an anglnof about .'to witli tint liori/on. ItH Nnt'face in ninny plncoii nIiowh the mai'kH of |rliii'ialiiin (oni< niuraiiu) lyin^ n^aiiiNt tlie nortbitrn Hiileof tlioNmalli'i' mount), lint for tim moHt part tliu jiarent li'ilgo in liiililen uuiler » ijuantity of its own rock broken np by fnmt artion. I fonnil a ;;rcat niunberof Ihni^stone liowlilcrH, erraticH, Hcattrroil tbroiiKli tiR, vallry of tlir .Ionian liivrr anil on tlio Hiili'M anil HnmmitH of the nioiin- taiiiH whirli liiinler it. Finally, it may bn intiTUHtin;; to 1\no\v that tlio natives told me that these Name fornmtimm Goutuintn^ fossilH existed in Huveral localities in the lake region of tlio interior. Very truly, yours, UussKi.i, W. IMkti.k. h'etjioii west and northwest of Frobisher Bay. — l">oin Mr. Porter's itccomit of Billiiiian's Fossil IMouiit, it is evident that similar Lower Silurian strata occur in the lake region of the interior of liaflln Jjand. Mr. K. M. Kindle' reports that Missionary Peck obtained from Lake Kennedy, whitth lies northwest of the head of Cumberland Souiul, the following;' drift fossils: Ziiphrcniis sp, ? [probably Streptelasma eornieiilnm]. Ilnhfsites vatcnuhdiis [probably var. (frarilis Hall]. Maduna mnijun '] [probably Maclurinti manitohcnsis]. Fjtulovvras proteifonnc. With the i'auna of Silliman's Fossil Mount as a guide, it is ]u-obable that no horizon other than the Trenton is indicated by the species cited. Dr. ]{i)bert Bell- reitorts that — Ou ice pans farther u|i the coast [from liig Island in Hudson iStrait], or to the ' Amer. .lourn. Sci.. Ith ser., II, 1«9(), p. 156. - ( Otservations on the (ieolojjy, etc., of Hudson .Strait and Hay, made in 1885. Ann- Kept. (;eol. and Nat. Hist. .>>nrvey of Ciinaila, new Ber., 1, 18S5, pp. 1)1). l-'or a sum- mary of North American Arctic gcoloyy sue the report of the same Survey for 1886, II, 1887, p. K. Nil, 1 103. TIlK.Snty lAI S.i Ul' llAtllS L.tSJf-SCIII ( lIFJii: 147 iiiiiilnv<lll^> of hIiiiIv riiiirl niiil of kiii.v IIiiiomIoiio witli I'lmHili, 111111111^ wliii'li 1,'iiriiliiiiililiH iiiiitii wiiH fiiHily ilimiiiftiiiMlh'il. SIh-IIh niid Itryo/.on, hclitii(;itiK to iiio*li>rnt)Hi'ri|itioii of Akpittok IhIiimiII. |)r. Fran/, lloiiH of llcrliii I now of Ninil from thiroto Frohiiihur Itny, iinil ovrrlli- th>' t;ritiiit«ia mill KiiiMNxm of Itulllim lliiv iiiiil hiivis Strait. \V» will not he fur iiHtray if \m> I'on- nri't lliiH extrimivo Siliiriiiii iliMtrict with tliti liniuMtoni'H which orciir to tho Hoiith of I^flnliiiKi liiiil which I'orni tin- Hut niiNteni half of Mclvillu IVniuHiila. Southward from NottillliiK, tlicNit roi^kn rlHu in low hill niiiKoa." Fartlier to the north, great areas of Upper Sihiriaii rocks occnir, yieUIing cliiiracteristic fossils er Silurian faunas. Such localities are FUry Point (liititiide 1'2^> 50' north, longitude !Hi° west), Depot Hay (latitude 7l*^ north, longitude \H^ west), Cape Hilgard (latitude 71)^ 41' north), and Hessels Hay (latitude HI" (»'). Miiduiea arvtiva with ActinoveniH nrhriHcptuiu Hall and UecvptiuuUten wptuni !>efran(;e (prob- ably = li. oinni) are found with Upper Silurian fossils on the west coast of King Williams Island. Maclurea, or Miwhirina^ is a genus restricted to the Lower Silurian, and the same is true of Aetinoveras etrhrixepiiim. On the other hand, Ktheridge has described as Jlelico- tonut naresii, a similar shell from the U^pper Siluriiin of OfHey Island (latitude 81^ 10' north) and with this the author has identitied a speci- men ill the U. 8. National Museum collected by Dr. E. Hessels at Polaris liay (latitude iSl^ .'iS' north). The preservation of these shells, however, is such that any identilication will have little vfilue. The foregoing facts cai) be interpreteiew Y^ork and the (Jaleua of Wisconsin and 'The types of this species are in the British .Museum, and Dr. Ilinde in his work on the Heceptiuulitiibe ((^uart. Jour. (ienl. i^oc, London, November, 1884, p. 845) gives tlio hori/oii as I.o\v«',r Silurian. -.Summary Kept, of Geol. .Surv. Dept. for the year 18y7-!»8, pp. 82, 83. NO. 1192. TRENTON FAUNA OF BAFFIN LANlt—SCIirCIfERT. 149 Miimesota, and nothing younger than the ITtica stage of the United States. The thickness of these beds is not less than UOO feet and prob- ably exceeds this. This sunnnary is based on information known to the author, and, while the evidence is meager, the essential geological age and the sequence of the rocks of Batlin Land seem to be established. PALEONTOLOGY. HaWn collections. — The few fossils collected at Silliman's Fossil Mount and brought to America by Mr. Ball were identified by It. P. Stevens' for the New York Lyceum of Natural History, -m follows: Maclurea magna Leseuer [probalily Macliirina mauilobenain']. Endocera» protelforme Hall? [^^Cameroverag proteij'orine]. Orthooeras (ba«lly worn siieciineus). UelioUteH (new Bpecies). Heliolites (now species). Halysitea catenulata. Iteceplaculites (new Hpecies) [= fR. oweni of this paper]. There is apparently nothing in this list but what was again discov- ered in 1897. Mr. Stevens writes that " the fossils, without doubt, are all Lower 3ilurian," and ; i x Varaatropli ia hew iplienta Hall j \ X Khyncholrvma iniit/uivalvis (Castelnau) ' ' X Ctenodoiita siibnai-uta flricli I [ .■- Cttnodonta frubisherentin, now H|M?cio8 ' Vleiiodonla carpenderi, new species Ctenudoiita bajiiieiiiiii, new species ' I ilodioludon arctica, now species | Whiteavexia lymtnetricuii, new H))ecies | Cyrlodunta nllimanenKis, new species : Cyrtiidonta iiibbera, I'lrii'ii variety | Yanuxemia'abrupttt, I'lridi > Vanuxeiida bitffinenitit, new species ' ir/(t(<'(to arcticun, new species [ X o * S a a a a 5^ z =5 ■-1 X X X spo Haffordia modenta I'lricfi. J'rutoicarthia jiervolvtuii I'lrich and Scoiield . Tetranota obiidiia Ulricli and Scotield Kokenia cuttatit I'lricli and S('otiel'leH \itiiia riijilana (Meek and Wortlien) lllo Kay Ihiliiiaiiiti'a {I'tiryiionntiipuH) ymidiiiji, now spocio.M. Ceruiiina pUurcxunthiinua liroon I X Total 10 X I X X X X X X X X 17 ■M 11 ! 41 17 152 PROCEEDlNdS OF Tilt! NATIONAL MtJSEtJM. VOL. XXlt. Age of SUUmaii's FoshU Mount. — From Mr. Porter's description, it will be seeu that the fossils recently collected at Silliman's Fossil Mount are from various liori/oiis, and yet there is nothing' to indicate the presence of more than one fauna. The foregoing list shows that at present there are 72 species linown from this locality, and of these 28 are restricted to it. There are, therefore, 54 species which are common to other lo«!alities, a goodly number with which to make safe correla- tions. Of these 54 species, 41, or 57 per cent of the linown fauna, are also found in the region of Minnesota, Wisconsin, and Iowa, while 17 are known to occur in New York and Ottawa. On comparing the 54 widely distributed sjjecies with those from definite stages in Minnesota, it is seen that 10 are also found in Hirds- eye (= Lowville), 17 in the Black K'iver, 38, or about 70 per cent, in the Galena, the , ])!. xxv, liss. Irt-le.— Wi\- ciii-.Li, and S( Ml ( UKiM. (i.ol. Minn., Ill, Pt. 1, 1893, p. !I0, pi. (i, ligs. 20,21. This characteristic Trenton cup coral is coinmnn in the strata of Silli- man's Fossil Mount, and agrees well with specimens from the (ralena horizon of Minnesota. Collectors. — J. N. Carpender, A. V. Shaw, and A. H. White. Cat. No. 28141, U.S.N.M. Tiie American Museum of Natural History has a number of specimens collected by Mr. K. W. Portei. M ' Cat. NO. 1102. TRENTON FAUNA OF liAFFlN LANIt-SGItVCllEUT. 155 CYSTOIDEA. Family CIIYPTOCRINID.E Zittel. POROCRINUS SHAWI, new species. (Plate XII, ngs. 1-3.) This species is most nearly related to P. umithi Grant,' as far as the shai>e of the dorsal cup, elevation of the costa>, and form of the ])lates are concerned. It differs, however, from all American species in that the circular pore-rhomb spaces are larger. This is particularly true of the lowest series, which occupy nearly the entire basal plates besides portions of two adjoining siibradials. The rhombs are also very large in the interradial areas on each side of the arm bases. The ambulacral grooves are narrow and short, and within the shallow ve.stibule terminate abruptly below into the body cavity. The margin bordering the large, central, circular opening is somewhat notched at each ambulacral groove, giving the impression tliat there may have been communication between the oral oi)eniMg and each ambulacral groove. The smaller ventral jilates at e not preserved in this specimen, which is the only one known. Named for Mr. A. \. Shaw, of Boston, Massachusetts, who was one of the Frobisher Bay party of 1807. Collector.— A. H. White, (^at. No. liSH."), U.S.N.M. Family LICHKNOCIIINID/E. LICHENOCRINUS AFFINIS Miller. Uchenocriniis affiiiia Mii.i.RR, .loiini. CJiiiii. Soc Nut. lliHt., V, 1882, p. 229, pi. ix, tigs. 7, 7a. But a single specimen of this sjjccies has been noted, and this was attached to an Orthoceras. It has the general as])ects of L. upinis iu the pentagonal column, form of body, slight convexity, number of plates, and the general irregularity of these, both in form ami arrangement. The genus Lichenorriniis has not been i)reviously recorded from rocks below the Iltica. In the (Mncinnatian grouj) specimens are often abun- dant where L. alfinix occurs in the upper third or Richmond stage. Collector. — I. N. Carpcnder. Cat. No. L'S14«;, IT.S.N.M. ' Ottawa Field Nat. Club, TraiiM. No. 2, 1881, p. 12, plate, (Ikh. 1-8. ir)G vnncKEinsuis of the xatiosm. misium. VUL. XXII. BRYOZOA. Family CERAMOPOUIID.K Ulricli. CRBPIPORA, species undetermined. Specimens of this species were sent to Mr. K. (). Ulricli, wh<» identified tliem as belonging to Crcpipora. The minute structure, however, is poorly i)reserved, and no thin seiitions were made. Collectors. — A. II. White, .1. N. Carpender, and A. V. Shaw. Cat. No. 28147, U.8.N.M. Class I3riA.CH:iC)I^( )DA.. Order PROTREMATA Beecher. Family ORTHID.E Woodward. ORTHIS TRICENARIA Conrad. Orthia tricenaria Conkad, Proc. Aciid. Nut. Sci. Phila., 1813, p. 333.— WiNcnKLt, and SciHJ( HEin, (ieol. Minn., Ill, Pt. 1, 18!>3, p. 418, pi. xxxii, ««. 18-23. This well-known and charaderistic Trenton species is represented by two specimens, which are small for this f()rm, but otherwise closely re- semble those from the (lalena shale of Minnesota. On Akpatok Island the species attained the largest growth known, being more than three tii)>tis as large as those found in Baffin Land. Collector.— J. N. Carpender. Cat. No. 28149, U.S.N.M. One speci- men was also found by Mr. R. W. Porter and is now in the American Museum of Natural History. ORTHIS (DALMANELLA) TESTUDINARIA (Dalman). Orthis {Dalmaiivlla) tealudiiiaria WiNcnKM, and SCHUCHEUT, Oeol. Minn., Ill, Pt. 2, 1893, p. 441, pi. xxxiu, figs. 17-22. This ubiquitous Lower Silurian species is very abundant at Silliraan's Fossil Mount, and at this locality is <|uite constant in its characters. The specimens belong to the variety with line stria*, in which the dorsal valve is often slightly convex, recalling the subgenus Khipidomella rather than Dalmanella. However, otiier examples have the typical flat dorsal valve, with a well-defined median sinus. Collectors. — J. N. Carpender, A. II. White, and A. V. Shaw. Cat. No. 28148, U.S.N.M. The American Museum of Natural History also has a number of specimens collected by Mr. \l. W. Porter. ORTHIS (PLECTORTHIS) PLICATELLA Hall. Orthis (Plevforlhia) fUcaieUa Winchkix and SciiuciiKUT, (Ieol. Minn., Ill, Pt. 1, 1893, p. 43fi, pi. XXXIII, lig.s. .-.-7. As a rule, this species is not abundant in the Trenton either in New York or in Minnesota, but at Silliiiiairs Fossil Mount it is a common shell. «l Nn.1103. TREXTON FAUNA OF ItAl'I'iy L.tSD—SCJircilKHT. 157 Cat. i A • The Arctic examples two larRe and robust, and a^jrec ratluT witli H|)eci- inons from VVatertowii, New VorU, than with those from Minnesota, which are somewliat smaller. Tlie species is often confounded with OrthtH {llebertvUu) borndh, but can be easily distinguished by the almost entire absence of fold and sinus. When these are present, how- ever, they are found to occu|>y a position the reverse of that seen in the latter si)ecies. VoUeciorH, — .1. N. Carpender, A. \. Shaw, and A. H. White. Cat. No. Ii81.')0, U.S.N.M. A number of specinu'us collected by Mr. K. W. Porter are in the American Museum of Natural History. ORTHIS (HEBERTELLA) BOREALIS (Billings). Orthis (Ifehertella) ImnaliH Wiyinv.u. and .S( iircHKur, (ieol. Minn., Ill, Pt. 1, 18!»3, i». 4:W, ligs. :t:ositiou of the fold and siuus, which is the reverse of that seen in Hall's ripecies. Collector. — J. N. Cai'pendcr. In the American Museum of Natural History there are three specimens collected by K. W. Porter. Cat. No. 28151, U.S.N.M. ORTHIS (HEBERTELLA?) BELLIRUGOSA (Conrad). ihrthia (Ifel)crlella') hcUnriiiiom Wincuki.i, iiiul SciiL'cnKKT, Oeol. Minn., Ill, I't. 1, 18i»3, i>. i:il, 1)1. xxxiii, tigH. 1-1. This species is never abundant in the Trenton, and the same is true in Hattin Land. Mr. Russell W. Porter fouud a single specimen, which is now in the American Museum of Natural History. This form also occurs on Akpatok Island, LTngava Bay, Labrador. ORTHIS (DINORTHIS) MEEDSI Winchell and Schuchert, var. ARCTICA, new variety. (Pliit(> XII, lij,'s. 7, S.) ()r1h\n (DiiiortliiH) mcedai Wincuki.i. luid Schi'ciiekt, Oeol. Minn., Ill, Pt. 1, 1893, p. 427, jO. xAll, li«8. ;{!M5. This species, winch is common in the Galena or Trenton stage of Minnesota, is also abundant at the Frobisher Bay locality. As in Min- nesota, it is liere also a very variable species. However, among the Ar('8illiimiirs Fossil Mount iilso n'nills O. {/>.) proovitn iiiid i>. {!>.) HubtiuatliaUt, showing; timt the tlir(>e prohahly belong to one Htock. ColltrtorH.—J. N. Carpendrr and A. IC. White, Cut. New. 'J.Sir»L»,3, U.S.N.M. A nuinhor oC H|K>(;inu>iiH aro in thu Anieritran Museum of Natural History, which were colleeted by Mr. U. VV. Torter. PLATYSTROPHIA BIFORATA ( Schlotheim ). I'latjiHtropliia hifornlii WiNt iiki.i. iiiiil .SciircuKKT, Oeol. Minn., Ill, Pt. 1, 1893, p. 15"), i>l. xxxm, linH. 5l-r)4. Tliis ubi(|uitouH Siinrian species appears to be rare at the Frobislier Bay hn'ality, since but tiiree specimens are present. These are small, a couditiou in harmony with tlufir Trenton nae, and have siiort hinjj« liiu^s devoid of hinge extensions. The hitter featuni is best deveh>ped in the upper or Kiciitnond stage of the CIncinnatian group. Collectors.—,]. N. Carpender and A. II. Whit*'. Cat. No. 281."»4, U.S.N.M. A single specinu'U is in the collection of the American Museum of Natural History. Family POUAMIJONITIDJ': Davidson. PARASTROPHIA HEMIPLICATA Hall. ParanlrophiH lieiiiiiilicalti .Scmi-cmkkt, Mull. V. 8. (Jool. .Snrv., No. 87, 1897, j). 300. The.se small early i)entameroids are under size in the Arctic^ lo. 1533, 1>1. i\. Ii;,'.s. 21-23; Anier. (ieol., .Will, ISKG, p. IM. The common h'liifnvhonella from the Uirdseye or Lowville and Hlack liiver stages, which is usually identified as /»'. iturehesrois Hall, is always devoid of tiie concentric lamell;i> so characteristic of //. incre- bcscritfi— h'. hi(V(iHiralvi.H of the Trenton stage. Occasional specimens occur with a few of the lamella' near the anterior margin, but gen- erally the shell is devoid of these, their places being occupied by very fine, wavy, concentric lines. In higher beds, these fine lines develop into stronger and more extended lamellic, which find their greatest development in h'hi/ncliotrem viiriii))l<' siihI ciiii not )»<> of iinicli aid iiMliHtiiiKuiHliiii^ tliisNli(>]l from U. iiioiiiiiriilriH, TliiUwouicoftoii foiiiiil aNsocJatcd in tin; Huint^ buds, anil if is tlicii (linictilt lo identify tlieni (!ori'*'ctly. This fact I(mI VVinclicll and ScliuclKMt, in IHiKt, to rcKurd botli as ludonfjin^f to on« sin'cios, It. iiniiiiiirtilris, htHulUji ami formation. — in tln^ liowvill*' and partirnlarly in tiie Bl»(!l{ liiver stagus of tli«^ Trenton in Minnesota and Wismnsin, Lex- iD|;ton, Kentneky, and in tlie<'ineinnatian ^Tonpat Savannali, Illinois. TluK species and /»'. inatiuiralrix mihtrinoiialis iin* unknown at Silli- inau's l<'(>Hsil Monnt. RHYNCHOTREMA INiCQUIVALVIS (Castelnau). Spiriftr imviiiiivalrta Cahtklnai', r.Msiii SyHtcnif Sil. r.\iiii'i'i(|ii(t Si'ptriili'iiiiiuUi, is4;<, i>. I(>, |il. xiv. (1^. H. Atrypa 'niirehimrnH IIai.i,, I'ul. N. V., I, lsi7, p. I Iti, jil. wxiii, liy:s. i;t(i-i:{A (proltulil.v not ]). l'K!», jil. i.xxix, lij;. tii. Ithyiicliolrrma inii, iil. xxxiii, \\<^. VJ. This shell is only an elongate variety of /•'. ina'ed. 160 I'UnCKKIHSiis nr TIH! SATIOSAL MUSfWit. vol,, XXII. Fmiiily NUCIl LIDJC (iriiy. CTENODONTa SUBNASUTA Ulrich? (I'liUn Mil, Mkn. I-*I,) Cimodoiila luhiiuiittu I'l.Hini, (iuul. Minn,, III, I't, V, IHIM, |i. tm, \t\, xui, hut. :u-;tii, Tliero iii« two pxainpl«'H of this Hix'cit's, and those appoar t<» nKi'Po bcHt witli MiiiiM'sota ,sp('ciiii('iis (»l' ('. Hiihiiiixutn. They wen* sent to Mr. K. O. iririch lor din-ct coinparisoii with his tyjH's. lie writes: You can not l»o fur wronjj if you identify tli('i!(3Mi»coiiu<'nH witii <'. iiiihnuniiln, .Still, tlu-ru Ih hiiiiix tloubt itn to tli«ir iilmtil.v. '\'\ni .Arctic N|M>riiueuH itre Ihi'kci' Mutu the typon, iinil iclHtivi'ly a !ittl« nioro clonKiitc, wliilo the liiimil oullinc is M(i»rcnly tm convex, ami lii(> unilituitM not ho lull iiiul evenly inunili'il. Finally, the Hiutillcr end, which I iini now Hiimeuhiit inclined to re^anl uh the anterior, in relatively wider in your HhellH, I may add that the lar^rer Hpccimeu indicateH a thinner hin)(e plate than in the typcH, so that, after all, tliciie H|i(nton of Manitohu. Colltvtorx.—,]. N. Car|M'iidcr and A. II. White. Cat. No. 28103, U.S.N.M. CTENODONTA CARPENDERI, new species. (I'hitoXIII, IIkh. i-:j.) This is the m»»8t abundant pelecypotl from 8illin»an's Fossil Mount and ajipears to be closely related to (J. vunei/<>rmin Ulrich.' It dif- fers, however, in various details, ])articularly in always beint; consid- erably larfjer. ('. vdrptiitlcri has also the jjeneral aspect of small specimens of <'. nasiita, but dirt'ers in the straight hinge line, especially that of the jtosterior end. which termiinites abruptly into the regularly convex outline of this portion of the shell. Mr. I'i. (). Ulrich, to whom several examples were sent, wrote as follows: ThcNc HpecinietiB are closely related to C. ciiiiriformin Ulrich, The tyjics of that 8]i()cicH are much Huialler, with the narrower end relatively Hlir)rter and the constric- tiiui more distinct, (iood H|)ecilic ditferenci!s are 'found in the ]i)mt<^ardinal region (i, e., aaHuniin;; that the wider end i,s posterior). Here the Arctic H])ecieH Ih more inijircHNod, cauHJn;; the umlionul ridp^ to he much more pronnnent, the postcardinal n1o]ics wider ani)var to n^rreu lioy wen' sent to . Ill' writer: I I'. HiihnuHiiin. Still, H itre Itti'Ki-r Muni tli(> >iitliii*) JM Hi'iircoly iiH illy, the Hiiiiillur «iipe«ies (Ulrich). (Platf XIU, «««. T-l» ) There is but a single example «>( this species present, atul this was provisionally idcntitled as V. m-ojielUi Lf IrM'h.' The author of tiie species writes that, while it has the geiuu'al aspect of C Hvojieltii, it is neverthe- less sulllciently distinct to be recognized as new. Mr. I Irich has made the following comparisons: At lli'MtHigUt tiiU Ih extr«iiiely like r, tfofieltli, lint on iloHur InNptxtion, and pnr- ticiiliirly wliuii coinpured with the tyiiosot' tliatHpnciert, certiiin piM'uliuritleH hn'timo ■o prominent tliiit I wondor that tliey were not oliMorvod itt once, 'i'he tlrHt ol' thene iit u deprei«Hion,or ratlier widening t'nrmw, uxtendintt vertiotdly froin the liualiHUcrosH the viilveii. ThJH Ih Hiiniciniit to euiiHe a HtraiKliteninti;, even a Hlit(ht concavity, in the ventral outline. The outline of the valveH illU'erH t'liither in tlie poNtventral (wider) reKiiui Itein^ more promlueut and more narrowly rounded here. In a car- dinal view the HpecieH agrecH heHt with r. Hvoflddi, lint in a Literal view the outline oorreHpondH hetter with V. mrdtiili* and (!. nilida I'Irich. I'he contour of tbe valves, however, HhoWH it to ho n distinct furiii, the iiieNial deprcRition poRNildy indicating relatiiiim to Hp«)cioB of the type ('. larinnln inrich. r. iKojIfldi uIho Iimn no radiating lineH; the cnucentrio lines are ei|nally nn delicate. CoUector. — H. W. I'orter. The type is in the American Museum of Natural History. CTBNODONTA FROBISHERENSIS, new species. (Plate XIll, li«H. 11-1 1.; Of this little shell there are two well-preserved specimens, which appear to be distinct from all other Ordovittian Ctenodoiitas. i'robtibly the species most uearly related is ('. alhertina U Irich,- from which it differs in having the beaks more centrally situated, the valves shallower, and in beiug less drawn out anteriorly. At Hrst this form was thought to be most closely related to ('. ovif'ormis IJIricli,' but the author of the latter species writes that the Arctic shell ''has different ])ropor- tions" and that it represents a new species. (J. ovi/ormin is less high, has narrowly rounded ends, and the beaks are situated nearer the mid- leiigtb. Its rounded-ovate form distingui.shcs it from the other Fro- bisher Hay species, all of which are nasute forms. Collectors, — J. N. Carpender and A. \'. Shaw. Cat. No. li.S105, U.8.N.M. Family MODIOLOFSID.F Ulridi. MODIOLODON ARCTICUS, nev^ species. (Plate XIII, 11k«. 18, 19.) There is a good cast of the interior of the valves of this shell in the present collection. The species is very much like M. patuliat Ulrich,^ 'Geol. Minn., Ill, Pt. 2, 1894, p. .593, pi. xm. Jigs. 53-58. •ibidem, p. ."19^ pi. xlii, fij,'8, 7ti-81'. '' Ibidem, p. ,586, ]il. xi.ii, lig. 29. * Ibidem, p. 521, pi. xxxvii, tigs. 20-24. Proc. N. M. vol. xxii II 162 riiOCKEinNdS OF THE NATIONAL MFSEVM. VOL. XXII. and was at first regarded by the writer as a variety of that form. M. arcticitN i.s liowever. nearer sub!. xxxix, ligs. 13-ir). The only example of this species was sent by the writer to ]\ir. Ulrich, who made the following comparisons: 18!M, p. .-)t(), ))l. XXXIX, (ig. 23. (ieol. Minn. III. Pt. ' Ibidem. Cauailian Nat. and (ieol.. Ill, lK"iS, p. 132. NO. 1192. TRENTOX rtrXA OF ILil'I'L\ LANl>—SCIir(), pi. xxxviii, Hgs. 39-44. Of this sj)ecies tliere are two examples, which Mr. ITlrich lias com- pared with the types. In Minnesota this form i.s found in the Middle Galena of Fillmore and Goodhue counties. Collector.—,]. N. Carpender. Cat. Nos. 1»81.")7, S, II.S.N.M. VANUXEMIA BAFFINENSIS, new species. (Plate XIll. figs. l'8-28. ) This species tinds its nearest relatives in W limjniana Satt'ord and 1'. Hiota (Whitfield'). It dttiers from these species in the greater oblicjuity of the .shell. The largest specimen figured (figs. 2!) and 30) is a worn exami)le, and is provisionally referred to V. hapiiiemis as a variety. When additional material is secured, it may prove to be a distinct species. ( Another specimen Just received from Mr. A. V. Shaw shows that the variety is probably a distinct species.) Collector.—,]. N. Carpender. Cat. No. 28100, I'.S.N.M. WHITELLA ARCTICUS, new species. (Plate XIII, figs. 23-1',-).) Ulrich writes that this species of WhitelUi is nearest his W. riifiatinn,'^ from which it dilVers in being nnich more erect. In fact. W. , I'.S.N.M. FamilvGKAMMYSIlD.K Hall. SAFFORDIA MODESTA Ulrith. Snffordifi moilcHta 11i,hk,'11, Geol. Minn., III. I't. 2, 18!U. \i. t)27, pi. m.i, tigs. 2!)-31. Of this fortn there are two specimens in the .\merican Mnseum of Nat- ural History, C()!ie(;ted by Mr. K. W. Porter. Externally they agree with the Minnesota sj>ecies. 'See (MM.l. Minn., Ill, Pt. 2, ISIM. p. mi '-Ibidem, ]i. ,'M)!t, pi. M.i, tig, 1, 104 PROCEEDINGS OF THE NATinXAL MUSEUM. VOL. XXII. Class O^HTROFOD^. Family PKOT()WAKTHIIDJ<] Ulrich. PROTOWARTHIA PERVOLUTA Ulrich and Scofield. rrofoirinthia perroliita IJutiCHaiul .Sroi'iELD, Geol. Minn., Ill, I't. 2, 1897, p. 871, ))1. i.xiii, liys. 21-27. This species is fiiirlj' eommoti at Sillimaii's Fossil Mount, and in some specimens the shell is preserved. Testiferons exam])les of /*. perroluta are distinguished from other species of the genus by the colninella like development of the inner lip. The sjiecimens were sent to Mr. Ulrich, who has compared them with his types. He writes that the Arctic examples are somewhat more angular on the back of the volutions than the type s])ecimens. CoUectorx.—J. N. Carpender and A. H. White. Cat. No. 28173, U.S.N.M. Family BUCANIID.E Ulrich. TETRANOTA OBSOLETA Ulrich and Scofield. Telranoia obsoleta Vuilv.H and Scokikld, Geol. Minn., Ill, Ft. 2, 1897, p. 880, pi. i.xv, fiKs. 19-23. Of this widely distributed shell there are eight examples in the })resent collection. Three were sent to Mr. Ulrich, who pronounced them typical examples of his T. ohsoleta. In the United States, this shell ranges from the Lowville stage into the Utica, and is found in Minnesota, Wisconsin, Kentucky, and at Cincannati, Ohio. (JoUevtors.—J . N. Cari)ender and A. II. White, ('at. No. 28175, r.S.N.M. Three specirijens (tollected by Mr. It. W. Porter are in the American Museum of Natural History. KOKENIA COSTALIS Ulrich and Scofield. Kokenia coatiilh ITr.uicii and Scoi ikm>, (ieoi. Minu., Ill, I't. 2, 1897, p. 8H2, pi. i,xi\ , lifis. 4(5-19. Two specimens of this interesting 8i)ecies. from the (lalena shales of Goodhue County, Minnesota, the type locality for this species, are in the United States National Museum. The two specimens from l-'ro- bisher Hay agree with the present exami)les in every way excepting in the number of revolving lines. Of these there are seven in the Minne- sota specimens, while in the Arctic individuals there are from eleven to twelve, of whi(!h the fourth, sixth, and eighth are tlie most prominent. The first, second, fourth, sixth, and eiglith revolving lines are continu- ous into the aperture, the others being interpolated on the last vohition. Extremely line transverse lines of growtli and a few varices indicating stages of growth are also present. VolU'ctor.—l. N. ( 'arpender. Cat. No. 2S17(i, U.S.N.M. I NO. 1192. TliENTON FAUNA OF BAFFIN LAND—SCHUCHEliT. 165 Family BELLEROPHONTIIDyE. BELLEROPHON SIMILIS Ulrich and Scoiield. liellerophon aimilia Ulricii and Scofield, Geol. Minn., Ill, Pt. 2, 1897, p. 919, pi. LXiv, CigB. 31-39. Of this species there are two examples, one of which is identical with lTlrich'3 figures thirty-two and thirty-three of tlie work cited. It is one of the characteristic fossils of the Trenton or Galena stage of Minnesota. Collector.— A. H. White. Cat. No. 28174, U.S.E.M. Family PLEUROTOMARIID.T'] d'Orbigny. LOPHOSPIRA SPIRONEMA Ulrich and Scoiield. Lophoapira apirouema Uluicii aud Scofield, Geol. Minn., Ill, Pt. 2, 1897, p. 983, pi. i-xxii, figs. 44-47. This is the most abundant gastropod found at Sillinian's Fossil Mount. The species was at first thought by the writer to be L. fill- morensis Ulrich aid Scotieid, but Mr. Ulrich, to whom three examples were sent, pronounced it L. spironema. The Arctic examples attained a far larger size than the Black Eiver specimens of Minnesota. Collectors.— A. H. White aud J. N. (3arpender. Cat. No. 28177, U.S.N. M. Other specimens collected by 11. W. Porter are in the Ameri- can Museum of Natural History. LIOSPIRA AMERICANA (Billings). Uoapirti cmerieana Tlrich and Scofiem), Geol. Minn., Ill, Pt. 2, 1897, p. 996. This very widely distributed and common species is abundant at Sillinian's Fossil Mount. The large umbilicus is completely filled with shell nuitter, but above in the earlier whorls it is open. Collectors. — A. II. Wiiite, A. V. Shaw, J. N. Carpender, and R. W. Porter. Cat. No. 28180, U.S.N.M. CLATHROSPIRA CONICA Ulrich and Scofield. ClaihfOKpiid von'ica ri.uicii and Scoi'ield, (ieol. Minn., Ill, Pt. 2, 1897, i>. 1008, pi. I. XX, ligs. 1-4. This is one of the abundant species at Silliman's Fossil Mount, and in the United States ranges from the lUack River group into the middle of the Cincinuatian group. The Arctic ('xami)h's attained a larger size than elsewhere, but otherwisi^ are considered by Mr. Ulrich to be in harmony with liis species. Collectors. — ,1. N. Carpender, A. V. Shaw, and A. II. Wliite. Cat. No. 28178, U.S.N..M. The American Museuai of Natural History also has specimens collectetl by Mr. R. W. Porter. 1G6 PUOCKEDlXiiS <>;-' THE NATIitSAL MISEUM. vol.. XXII. SEELYA(?) (PLETHOSPIRA?) ULRICHI, new species. (I'llltt) Xll, ti^H. }», 10.) This interesting little shell has many of the characrteristics of S. rcntrmmt ITlrich,' from the Calcil'erous (Heekinantown) stage. It is, however, a much smaller shell, and (litters from all known species of Seelya in having tlie revolving bands nearly obsolete. There are four of these shells, which were sent to Mr. Ulrieh for iden- titication. He writes : The B))e(;iiiien8 are casts of the interior, and the revolving peripheral furrows probably have nothing to do with tlie revolving sculpture of the true Seelya. Siiui- liir furrows oi'cur in good casts of Lophospira boirdeni and other Fleurotomariida-. The band, I believe, was of the Hat or concave type, as in Seelya, I'hthospira, and Ifonnoioma, but, as it wuh evidently close to the suture and partly covered by same, it is too low on the whorls to be in strict accordance with these genera. Collector.— A. H. White. Cat. No. 28187, U.S.N.M. The American Museun> of Natural History has two specimens collected by Mr. li. W. Porter. The species is named for Mr. K. O. Ulrieh, who has accomplished much in bringing about a better understanding of the fossils of the American Lower Silurian. Family KUOMPHALIDiE. HELICOTOMA(?) (LIOSPIRA.') LARVATA Salter. Helkotoina hirrata Hii-i.iNGS, Canadian Organic Keniains, Decade I, 1859, p. 15, pi. II, figs. 11-11. Of this species there is a single excellent speon the (irobleni is in favor of retaining the species under Ifvlicoloma. In Canada this is a Black Itiver species. Collector.— A. II. Wliite. Cat. No. 28179, U.S.N.M. I Family MACLUIIIID.F Woodward. MACLURINA MANITOBENSIS (Whiteaves). Mavhiriua mbtiinin IMurii and Scoiikm), (ieol. Minn., Ill, Pt. 2, 1897, p. 1041, jd. L.wvi, tigs. J, 5; pi. i.xxxii, tig. 4:".. This species is common at Silliman's Fossil Mount and attains a large size, one specimen measuring nearly o inches in diameter. In '(Jeol. .Miun. HI, rt, 2, 1S97, p. KKlit, ligs. 7, h, c, d, m t<'xt. NO. 1102. TRENTON FAUNA OF HAFFIN LAND—SCHVCHERT. 167 Manitoba, it attaiiiH a diameter of 8A inches. It is a characteristic species of the Trentou. CoUectom. — J. N. Carpender, A. V. Shaw, and A. II. White. Oat. No. 28183, U.8.N.M. MACLURINA CUNEATA (Whitfield). Maelurira cuneata ITlricii and Scokiem), Geol. Minn., Ill, Pt. 2, 1H97, p. 1042, 111. i.xxvi, tigM. 1-3; pi. Lxxxii, iig. 46. Of this species there are two typical specimens witli the character- istic, small umbilical perforation. CuUevtor.—J. N. Carpender. Cat. No. 28184, IJ.S.N.M. MACLUREA CRASSA Ulrich and Scofield. Maclurea crassa I'MiiCii and Scokield, Geol. Minn., Ill, Pt. 2, 1897, p. 1040, pi. Lxxv, ligs. 12-14. One example of this species measures nearly 3 inches in diameter, which is larger than the Minnesota specimens, but this is in kee])iiig; with the greater size attained by the Maclureas and Macluriuas in the far north. Collectors. — J. N. Carpender and A. V. Shaw. Cat. No. 28182, U.S.N. M. Family TIIOCHONEMATID^ Ulrich. TROCHONEMA UMBILICATUM (Hall). Trochonema iimbilicatiim Ui.kkii and Scokield, Ge(d. Minn., Ill, Pt. 2, 1897, 1». 1047, pi. Lxxvii, ii^s. 1-3. Of this widely distributed Lower Silurian shell, six specimens are proseiit. They preserve most of the shell, and show considerable sur- face detail. Collectors. — J. N. Carpender, A. V. Shaw, and A. H. White. Cat. No. 2S18(>, U.S.N.M. Other specimen.* collected by Mr. K. W. Porter are in the American Mu.seum of Natural History. TROCHONEMA (EUNEMA) ROBBINSI Ulrich and Scofield. Trochonema (luiucma) robbinsi Uliucm and Scokield, (Jeol. Minn., Ill, Pt. 2, 1H97, i>. 1053, pi. LXXVI, figs. 11-15. Three examjdes of this species are present, only one of \«hich is well ])reserved. These were sent to Mr. lJlri(!ii for comparison with T. rob- hinsi and 7'. saltcri. He writes as follows: These speciiiu'iis possibly indicate a t'orni iiiteriiiediato lietweeu T. (A'.) iiimiUa and T.(E,) robhiiisi I'lricli and .Scolield. The iiiipcr whorls ol' the best Niieciint'n agreci rather closely with the iorniei-, while the last whorl, with its relatively narrow lieripheral baini, is more in aci'ordance with the latter H|)('C'ies. It is to be borne in mind, however, that it is only the shell-less portion of the specimen that ajjreo with T.(E,) nimilin, the ojiposite side of the s;inie whorls showing no trace of the ridge near the suture, which is strouu;ly developed and is characteristic of /'. niinUia. 168 PIIOCEEDINGS OF THE WITIOSAL Ml'SElM. Collector.— .1. N. Oarpeuder. Cat. No. 2S18:), IT.S.N.M. The best speciinei) was found by Mr. li. VV. Porter, and is now in tlie Aniericau Museum of Natural History. HOLOPEA ARCTICA, new species. (Pluto XII, 11r8. U-IC.) This little IFoIopea lias its nearest relation In II. ampin im—SvnUrHKl{T. 1G9 'V Order TETRABRANCHIATA. Family ENDOCEUATID.K. CAMEROCERAS PROTEIFORME (Hall;. Caiiieroceraii iirolvifornw Ci.ahkk, (ieol. Minn., Ill, I't. 2, 18!t7, ]». 777, i>l8. .\i.\iii-i.i, I. III. Of this corniiioii s])ecies there is ono small but w«'ll-i)reservtMl fraj;- ment showing the submar^iiial siphon. In a lenj^th of 2 inches, there are seven chambers uiul eight septa. CoUevtor.—J. N. Oarpender. Cat. No. 28191, U.S.N.M. Family OKTIK )C EKATID .E. ORTHOCERAS OLORUS Hall, var. BAFFINENSIS. new variety. (Plate XII, lijis. 19-22.) (h-llioferiis rertehralc Hma., Pal. N. Y,, I, 1847, p. 201, pi. xliii, ligs. .5-5o (not Schlotheini, 1820). (hthoccras oloriis Ham., Miller's Anier. Pal. Foss., Ist od., 1877, p. 215. The Arctic e.\ami)les of this form, of which there are three, do not appear to attain the large size of the New York specimens. Hall describes the species with " strong longitudinal striu','' while the Arctic specimens have very fine ecjuidistant lines, between each of which are from 3 to (i exceedingly delicate ones. This difference in the ornamen- tation, together with the smaller size, is regarded of suflBcient impor- tance for varietal distinction. There is no other American Lower Silurian annulated species with which it can be compared. Collectors.— 6. N. Carpender and A. H. White. Cat. No. 28192, U.S.N.M. ORTHOCERAS BILINEATUM Hall. Orthoccrax bilinratuin Ci.aukk, Geol. Minn., Ill, Pt. 2, 1897, p. 786, pi. XLVii, tijis. 20, 21; pi. i.iv, ligs. (!, 7. Of this species tliere is one small specimen annulated throughout. The characteristic, regularly alternating, larger and smaller lines of ornamentation are preserved. Collector.— A. 11. White. Cat. No. 28193, U.S.N.M. ORTHOCERAS PORTERI, new species. (Plate .MI, ,'H. 17, IK.) Shell small, not annidated,taperin{;' slowly, with an apical anffleof about T'^, section oriffinally circular, septa ".> in the length of 1 inch ; siidiuncle larj-e, and apparently in contact with the outer wall. Surface with I.'l widely separated prominent lonjfitudiinil costal, which are crossed somewhat irrejjularly by concentric lamellie, anteriorly directed, and 1 to eat;h septum. Here and tiiere two or three intermediate vertical lines occur between the longitudinal costa*. Collector.—,]. N. Carpemler. Cat. No. 28195, U.S.N.M. Family CYKTOCEHATID.T^.. CY .vTOCERAS MANITOBENSE Whiteaves. Ci/rtoctran iiiaintobcvye Wiiitkavks, Trsnis. Royal Soc. ol' Cnntulii, Sec. I, VII, 18H!», p. SO, |)1. MM, ligs. ;f, l; ])!. xv, lij;. 4; (iool. Siirv., Canatla, Pul. Toss., Ill, lWt7, p. 223. Oncoreran mdnitohriiae Ci.KMKK, Oeol. Minu., Ill, Pt. 2, IHit", i>. "!»!». This species is the most abundant of the Cephalopoda at Silliman's Fossil Mount. The writer sent the specimens to Profe>sor Whiteaves, who (!ompared them with the types, and subsequently reported that they are "ai)parently exactly the same species as C. manitohensc Whiteaves freg, Manitoba. We have very similar a|)ecimens from Akpatok Island, Hudson Strait." The liatlin Laml specimens are smaller than those from Manitoba. Ccllrctors.—A. N. Carpi'iider, A. V. Shaw, and A. IT. White. Cat. No. 2811!), U.S.N.M. CYRTOCERAS CORNULUM, new species. (Piatt! XIV, (ijrs. 8-10.) This little shell is clearly related to the p'-yvions speciies, having many of its character."^. It ,'H. 11-13.) This small species of Cyrtoceras has the general asj)ect of C. manito- bense, and for a time was regarded as tlie young of that species, yet a comparison shows that C, Imffinensis has a somewhat smaller apical angle. The diagnostic feature, however, is in the depth of the air chambers. These are much more shallow and do not increase in depth with growth nearly as rapidly as in 0. manitobenite, there being twenty- two of these in 25 mm., while in the latter species at a similar stage of growth there are about sixteen. VoUevtor.—A. H. White. Oat. No. 28198, U.S.N.M. Family ONCOCEKATID.E. CLINOCERAS EXIGUUM (Billings). Cyrtoreras rjrigiium Hii.i.ixd.s, Can. Nat. tmd (Jool., V, 18ti(), p. 172, figs. 17, 18. (htcoceruH ejiiiuinii Ci.akkk, (ieol. Minn., Ill, Pt. 2, 1897, p. 7!t8, pi. i.viii, liKS. 10, 11. In this collection there are live specimens of this species, three of which i)reserve more or less of the body chamber, and permit a recon- struction of the form of the shell. The body chamber was not less than 15 mm. in length and the entire shell not less than 58 mm. Billings gives the probable length as about 50 mm., which is very close to the protrac- tion based on Arctic material. Cllarke writes that the Minnesota s[)eci- mens i)r()l)ably did not exceed 30 mm., but as his specimens are very small fragments, this estimate is probably short of the actual length. The tirst twelve septu back of the living chamber occupy 22 mm., and in another specimen there are nine in l'.» mm. The depth of the air chambers decreases very little toward the apex, the average being a little less than 2 mm. down to where the shell has adian»eter of 3.5 mm. Specimens from shale are usually compressed, and this is the condi- tion of the Arctic material, but the shell was circular in outline, witli a very small central siphnncle. This species is related to Oncoveras untmiaforiiiiN Whitfield, which Clarke referred to Clinocertis. The Arctic material shows the shell to be gently arcuate and to possess the other generic characters of ('lino- cerax. Billings's species sliouhl be referred to Maschke's genus. Vollectorn.—J. N. Carpender and A. li. White. Cat. No. 281 !>y, U.S.N.M. 172 I'UitcEEhisas or rin<: s.\rinsM. \n sij-m. VOL. XXII. ONCOCERAS ARCTICUM, new species. (Tlttto XIV, IlKH. 1-7.) As shown by tlu' tlgnres, this spniU's dlflVrs from iill otlior Americiin OncnvnuH in the yreat iinferoiM)steri()r curvature of tiie ventral side of the shell. This is caused Ity the rH|)idly increasing; depth of the air ehatnbers toward the ventral side, where they are about twice the depth of the dorsum. Sipliuncle small, slightly constricted at each sei)tum, and closely adjoining the ventral wall e.vcept immediately beneath the living; chamber, where it is slightly detlected doi-sally. Venter more broadly nmnded than the dorsum. Living chamber large, with the sides slightly constricted, not less than 21 mm. deep, 3.'( mm. dorso-ventrally, and 21 mm. transversely. ° The cast is smooth and i)re- serves no nuirkings of the exterior. Ci/rtoceraH coniulHin was ttrst thought to bo the young stage of Omocerax arcticiiiH, but its section is more elongate oval, with the dorsal side more rounded, the reverse being true in the latter species. The chand)ers also are . miupium, the giant of the genus, which is found at East Selkirk, in Manitoba. The present form seems to be most closely related to 0. fiihhosum Whiteaves' {=(). irhitt'dVfNi Miller), but has not the numuloidal siphuncle of that species, nor the sigmoid outline of the se])ta on the dor.sum. The living chamber, also, is shallower, being about L'S n;m. deep. The con- striction of O. tiiniidum recalls that seen in PoUriorcnis or mm. inside the ventral wall. Septa regularly but deejdy oii with (). irhitraresi Miller. He reports that Onc. irhitearesi Miller ( = (>. (/ibhosHm Whiteaves, jiot Hall) in lateral contour, but in your specimen the body chamber does not seem to narrow so abruptly as it always does in O. n-hiteitresi, and shows no sign of any constriction at the ai)erture." Collcctor.--,h X. Caipender. Cat. No. 2S1!K», IJ.S.X.M. I I Traus. Hoyal Sor. Canada, Sec. 4, IV, lS8!t, p, 80, jtl. xv, tig. 43. ^«L. XXII, NO. no2. TRKSTox /'./r.v.i or ittrns L.tsit—scUDciihiir. 173 POTERIOCERAS, species undetermined. Tliero is a poor Hp(>chii(Mi of thi.s ^ciiiih tVuiii tliu FrobiHliur Itay locality. It wuh tlioii^lit to btt a Hiiiall HpcciiiuMi of /'. nohih; and was thoret'ore sent to I'rofessor Wliitttiivcs' tor comparison. Ue, liowdver, writes: Wo )iuv« iiiithiii); (txaotly like thin. It Ih very Hiiiiilar in Nhaite to /'. nobile, excupt tliiit till* liittor \h Hoiiimvliiit roiiiprt'HHtMl iiiid yoiirn Ih not. Tint ditlt'i'mvc in m1/o lietweeii y(>iii'Hp«ciinen iiiiil iiiirH In, iifutiiirH*), ciioriiioiiH. Voiir mIicII iiIno iit not s ery iinliki) thi- HO riillfd liomiiliocenni iriminm ItilliuK'*. I>>*t tliiit h|i<)imiim in ovutit in triiiiH- verHf Bcction, |ioHHilily I'roin l.itDi'iil pruBNiiri'. Your M|iu('iiiirii Ih, ! hIioiiIiI think, iiioHt likely II I'olrriinniiH, Iml too iiii|ierfert to hIiow IIh Hiii-cilic chiinictrrH or iiniuitiiiH, Collector.—.]. N. Carpeiidcr. Cut. No. liHllili, [J.S.N'.M. Family TAKlMIYCnilRATID.K Hyatt. EURYSTOMITES PLICATUS Whiteaves ? Kiiriintomitva pllcafim Whitkavkh, L'im. Kec .Sci., VI, 1896, p. 31)5; Oool. 8iirv. Cimftdiv, Pal. Fo«h., Ill, I't. U, 1«97, p. 225, lifjH. l">, H>; pi. xxvii, (ig. 2. The only specimen of this species present is not well preserved, but has jiarta of one and one-half whorls. Professor Whiteaves, who saw the specimen, writes that it is "probably I'JurifHtomitrN plkatus White- aves. At any rate, it has the same outline in transverse section, with Ihe dorsum impressed by a shallow and rather narrow furrow of uiii oI Natiiiiil IliHtory Iihh two HpuuiiiieiiH ('o!ly Mr. II. NV. I'orttM'. ILLiGNUS CRASSICAUDA AMERICANUS iBillings). ninnim amiriviiiiun Cl.MtKy, (ieol. Minn., Ill, I'l. -', IH!»I, |». 711, I1/(n.20-2;«. Oiiu tine enrolled Hpeciiiien ol this well-known .s|>(M'ieH wiih loiiinl by Mi. K. (I. (loodridye, (»!' New York City, and was very kindly >,'iven to the I". H. National Museum. Mr. I{. VV. iVuter alsotolleeted tw(» tine si>ecinieus, whicli are now in the Anteriean iMuseiiin ut' Natural llist(U'y. These ajiree excellently with thin species, the best examples of which arc from Trenton KallH, New York. t'olhrtinN. — l-', < J. (ioodridKe. .1. N. Curpender, A. \. Hliaw, and A. II. White. Cat. No. JS107, IT.IS.N.M. ISOTELUS OIOAS DeKay. Isotelun fiKjan C'LAUKK, (Jeol. Minn., Ill, I't. 2, lH!t4, pp. 701-7.) The cei>halon of this species recalls that of n.{I\)el)omeei>H Clarke in the characters of the glabella and in the great prominence of the eyes. However, in l>.{l'.)(io(nlri(1ecimen8. The pygidium is likewise ie,ss triangular than in I>.{I'.)ehofacciin, ami while there are ten or eleven annulations on the axis, there are not more than five pleunc. These are well develope4, p 7;^l. There are three examples of this species in the collection, none of which are entire, but all agree well with New York specimens. The species did not, here attain quite the large size of New York specimens, but one glal)ella shows a growth about two-thirds of the lai'gest from the latter hxiality. ColUrtor.—\. 11. White. Cat. No. 'JSKiO, C.S.N.M. \ ••I.. XXII ( lit. ■y liiiH NO. un. THEyTOX FAIWA of IIMUS I .IM) St lit CUtCUT. 17ft SUMMARY. Tlw niily Ijowoi Siluriiiii liorizoiiH known in nnitlit'UMtrrn Airli*- Aiimi'iru arti of 'l"reii''i»n and I'twn ayr. 'I'Im' latter /,<)n«^ appeals only oil tlu> nortli slioit of Frohislicr Itay, hut tlit> Trmtoii is t'oiind in various |>lac<'s (Voiii tiic north shore of IIiiiIhoii Strait to latitinli- Sl'^ north. Tho Lower Hilurian is tliiekest on Akpatok Island, where it is from 4(K) to .">0t» t«et in depth. Ur. I'lell, however, estimates the entire thiekness «d' these strata in this region to he not less than MOii fWM. In llalhii liand, and apparently elsewli(!rii in Arctic Aiiieriea, tiie Lower Hilurian Htrata reHts uneont'ortnahly on ohl erystalline rocks. To tiie iKuth of Ballln Land, the former are overlain l>y heds of Niay ara or Wenlock age. Thn Trenton faunas, octmrrtiiK in various places arouml tlie insular Ardnean iiiicUmis of North America, havu much in common, and this indicateH tliat the conditions at that time wt^e very similar, wliile the sea was in <'oinniunication throughout. As yet, liowever, the distri- bution of the strata, together with tiieir faunas, are well known only to the south and .southeast of tho Archii-an nuch>us, yet that of the west (>Linitoha) and of the northeast (Batlin Land) sliow direct com miinication. Tlie lialtin Laiul fauna had an early introduction of I 'pper Silurian genera in the corals llalysitcs, Li/illiti, nuil I'liisinopotd. in >Linitol)a similar conditions occur in the presence of nnh/sitcs, luirosites, and JUplifiplnfUum. Other np|)or Silurian types do not api)ear to be present. The Trenton fauna of Silliman's I'ossil Mount, at the head (»f Fro- bisher May, has seventy two species, of wliicth twj'iity ci^iht are restricted to it. This fauna shows an intimate relationship ^vitli that of the ( ialena of Minnesota, Iowa, and Wisconsin. I''ifty-«i'\'t'" l>t»r cent of tiu' species ution, and are tlicrefore less sensitive to ditfer."' g habitats apt to occMir in widely sei)aiated regions. On the other hand, the ceplialo|>odH, and i)articularly the l>eleey|)ods, indicate a shorter geograi»hical range. The almost (complete absence of Hryozoa iri ^e Hallin liand Trenton contrasts stiongly with the great development of these animals in Minnesota and elsewhere in the Inited States. 176 PROCEEDINGS OF THE NATIONAL MUSEUM. EXPLANATION OF PLATES. [From (lrawiu(.'s by Mr. E. ( >. L'LUicu.J platk xn. Poroirrimis nhawi, p. 155. Fig. 1. Posterior view of the calyx; eulai'ged. 2. Anterior view; natiirtil Hi/e. 3. Ventral view; enliirged. DalmanlteH ( PteriKiomctopna) fioodridgii, p. 174. ■1. 'I'ho i)ygidiiim eupponed to be of this 8])ecies, 5, (). Two views of tho cephalou. Ortliis (Dinorthiii) meedai arctica, p. 157. 7,8. Dorsal and proiile viowM. Seeh/a (.') { I'lethospira .') itlrirhi, p. 166. 9, 10. Two views showing the nearly obsolete revolving bands. TrocliHH f, species iindeterniined, p. 168. 11-13. Tliret' viewn of the only .specimen of this genus. Holopea arctiva, p. 168. 14, 15. Two views of the best specimen. 16. Surface ornamentation; x5. OrthocemH acalariforviis, p. 170. 17. The ornamentation. 18. Sectional vie' ', with the positio'^ of the sipho. Ofllioccran olorim ha(fi)ieiinin, p. 169. 19. 21, 22. Views of tiiiee specimeuM. 20. Surface ornamentation; xlO. Orthocvrax porhri, p. 16!). 23. View of the exterior. 24. Surface ornamentation ; x5. 25. Sectional view, with tlie position of the siplio. I'l.ATIO XIII. (tviiiiiiontd ciiri>eiiileri, p. 160. Figs. 1-3. Three views of the liirgest si>erinien. Clfiiiidoiilii Hithnamilii fliieh?, p. 160. 4-6. Three views of the l>est sj)eciinen. Clcnodoiitn baffinens'iH, p. 161. 7-9. 'fhree views of the type s]iecimen. 10. Surf;we ornamentation; xlO. Ctvnodonta frohiaherensis, p. 161. 11-13. Tliree views of the best speiimen. 14. Left VMJve of another sj)ecimen. IVIiitearraia xi/mmiiriciiK. p. 11)2. 1.5-17. Three views o»' the type specimen. VOL. XXII. NO. 1192. TRENTON FAUNA OF BAFFIN LAND— SC HFC TIERT. 177 MoiUolodon arcHcug, p. 161. 18, 19. ViowB of the cast of the interior. Allodeama (?) species umletermined. 20-22. Three views of the only specimen. This species is for the present not deacribed. Whitella arclicua, p. 163, 23-25. Three views of the type specimen. I'anuxemia baffinensia, p. 163. 26-28. Threes views of the type specimen. 29 30. Two views of ii large specimen which proliahly is a distinct form. Cyrtodonta aillimanenais, p. 162. 31-33. Views of the type specimens. Cyrtodonta (?) gibhcra Ulrich, var., p. 162. 34-36. View of the only example. Plate XIV. OncoceraH tiimidum, p. 172. Fig. i. Ventral side. 2. Side view. 3. Sectiouiil view of the larger end. Oncocerm arcticum, p. 172. 4. View of the dorsum. .5. Side view. 6. Scction.il view, with the position of the sipho. 7. Ventral side. Cyrtoverax corntilum, p. 170. 8. Side view, showing the radiating furrows of the iinier side of the shell. 9. Ventral view. 10. Ontline of the shell transversely. Cyrtocevas haffinenain, p. 171. 11. Side view. 12. Ventral view. 13. End vimv with ahout half the length of the shell drawn in, Proc. J^. M. vol. xxii 12 U. S. NATIONAL MUSEUM PROCEEDINGb, VOL XXII PL. XII i .i F(JSSILS FROM SiLLIMAN'S MoUNT. FnR FXPLA\ATIO\ OF PLATE SEE PAGE 176. If* U. S. NATIONAL MUSEUM PROCEEDINGS, VOL. XXII PL. XIII m: -X, ^- 15 17 S3 l.//r 'i ^4-^'-^ 10 14 ^"^ ( 16 84 80 86 ii 4 33 38 SO 88 4^ 87 %1- 3i ^y Pelecypods from Silliman'S Mount. For explanation o^ platf see pages 176. 177. 18 18 SO 81 (P 3fi 1\$^ 36 miii-'^ - ■ " ,' PROCEEDINGS, VOL. XXII PL. XIV CEPHALOPODS from SiLLIMAN't, MoUNT. For explanatio\ of plate see pai.e 177, '.K-'mmtAnift. jiTSTT' *~ ^^ "^ ' A. i At- *,-