IMAGE EVALUATION 
 TEST TARGET (MT-S) 
 
 1.0 
 
 I.I 
 
 ■- ilia 
 
 ■ 50 
 
 112.5 
 
 12.2 
 
 12.0 
 
 1.8 
 
 
 1.25 
 
 1.4 1.6 
 
 : E 
 
 
 -* 6" 
 
 ► 
 
 o 
 
 5^ 
 
 ^F 
 
 c^ 
 
 e". 
 
 a. 
 
 
 
 uy^/ 
 
 /A 
 
 Fhotogiapiiic 
 
 Sciences 
 Corporation 
 
 s. 
 
 ip 
 
 4f 
 
 <> 
 
 ^9) 
 
 N^ ^>\ WrS 
 
 
 
 ^^ 
 
 ''i 
 
 23 WEST MAIN STREET 
 
 WEBSTER, N.Y. 14580 
 
 (716) 872-4503 
 
 Pi? 
 
\ 
 
 f^ 
 
 
 m>. 
 
 f 
 
 CIHM/ICMH 
 Microfiche 
 
 CIHM/ICMH 
 Collection de 
 microfiches. 
 
 Canadian Institute for Historical Microreproductions / Instltut Canadian de microreproductions historiques 
 
 1 
 
 1Qft7 
 
Technical and Bibliographic Notes/Notes techniques et bibliographiques 
 
 The Institute has attempted to obtain the bost 
 original copy available for filnning. Features of this 
 copy which may be bibliographically unique. 
 which may alter any of the images in the 
 reproduction, or which may significantly change 
 the usual method of filming, are checked below. 
 
 D 
 
 Coloured covers/ 
 Couverture de couleur 
 
 □ Covers Jamaged/ 
 Couverture endommagie 
 
 n 
 
 ''overs restored and/or laminated/ 
 ouverture restauide «t/ou pelliculde 
 
 ■^ Cover title missing/ 
 
 Le titre de couverture manque 
 
 D 
 D 
 D 
 D 
 D 
 
 D 
 
 D 
 
 Coloured maps/ 
 
 Cartes gAographiques en couleur 
 
 Coloured ink (i.e. other than blue or black)/ 
 Encre da couleur (i.e. autre que bleue ou noire) 
 
 Coloured plates and/or illustrations/ 
 Ptanches et/ou illustrations en couleur 
 
 Bound with other material/ 
 Reli4 avec d'autres documents 
 
 Tight binding may cause shadows or distortion 
 along interior margin/ 
 
 Lareliure serree peut causer de I'ombre ou de la 
 distorsion le long de la marge interieure 
 
 Blank leaves added during restoration may 
 appear within the text. Whenever possible, these 
 have been omitted from filming/ 
 II se peut que certaines pages blanches ajouties 
 lors d'une restauration apparaissent dans le texte, 
 mais. lorsque cela dtait possible, ces pages n'ont 
 pas iti film^es. 
 
 Additional comments:/ 
 Commentaires suppl6mentaires; 
 
 L'Institut a microfilme le meilleur exemplaire 
 qu'il iui a ete possible de se procurer. Les details 
 de cet exemplaire qui sont peut-etre uniques du 
 point de vue bibliographique. qui peuvent modifier 
 une image reproduite. ou qui peuvent exigcr une 
 modification dans la m^^hode normale de fiinaoe 
 sont indiquis ci-dessous. 
 
 □ Coloured pages/ 
 Pages de couleur 
 
 □ Pages damaged/ 
 Pages endommagees 
 
 □ Pages restored and/or laminated/ 
 Pages restaurees et/ou pelliculdes 
 
 I — J} Pages discoloured, stained or foxed/ 
 
 D 
 D 
 
 Pages d<^colordes. tachet^es ou piquees 
 
 Pages detached/ 
 Pages d^tachees 
 
 Showthrough> 
 Transparence 
 
 Quality of prir 
 
 Oualita indgale de I'impression 
 
 Includes supplementary materii 
 Comprsnd di> materiel supplementaire 
 
 I — I Pages detached/ 
 
 ryi Showthrough/ 
 
 I I Quality of print varies/ 
 
 I 1 Includes supplementary material/ 
 
 Only edition available/ 
 Seule Edition Jisponible 
 
 Pages wholly or partially obscured by errata 
 slips, tissues, etc.. have been refilmed to 
 ensure the best possible image/ 
 Les pages totalement ou partiellement 
 obscurcies par un feuillet d'errata. une pelure, 
 etc.. cnt 6t6 film^es A nouveau de facon a 
 obtenir la meilleure image possible. 
 
 The CI 
 to the 
 
 The ir 
 poMit 
 of the 
 filmin 
 
 Origin 
 begini 
 the \t^ 
 sion, 
 other 
 first p 
 sion. 
 or illu 
 
 TheU 
 shall 
 TINUI 
 whict 
 
 Maps 
 
 differ 
 
 entira 
 
 begin 
 
 right 
 
 requii 
 
 mathi 
 
 This item is filmed at the reduction ratio checked below/ 
 
 Ca document est film* au taux de reduction indiqi '? ci-dessous. 
 
 10X 
 
 
 
 
 14X 
 
 
 
 
 18X 
 
 
 
 
 22X 
 
 
 
 
 26X 
 
 
 
 30X 
 
 
 ' 
 
 
 
 
 
 
 
 
 
 
 y 
 
 
 
 
 
 
 
 
 
 
 1 
 
 
 
 19* 
 
 
 
 
 1fiX 
 
 
 
 
 20X 
 
 
 
 
 24X 
 
 
 
 
 28X 
 
 
 32X 
 
s 
 
 I 
 
 fier 
 
 le 
 
 pe 
 
 The copy filmed h«r« has been reproduced thanks 
 to the generosity of: 
 
 Library, 
 
 Geulogical Survey of Canada 
 
 The images appearing here are the best quality 
 possible considering the condition and legibility 
 of the original copy and in keeping with the 
 filming contract specifications. 
 
 L'sxemplaire fllmA fut reproduit grica a la 
 ginirositi de: 
 
 Bibliothdque, 
 
 CoiTiiniHion Gtologique du Canada 
 
 Lea images suivantra ont 4tA reproduites avec le 
 plua grand soin. compto tenu de la conditicn at 
 de la netteti de l'sxemplaire filmi, at en 
 eonformiti avec lea conditions du contrat de 
 fllmaga. 
 
 Original copiea in printed paper covers are filmed 
 beginning witn the front cover and ending on 
 the l&st page with a printed or illustrated impres- 
 sion, or the hack cover when appropriate. All 
 other original copies are filmed beginning on the 
 first page with a printed or illustrated impres- 
 sion, and ending on tne last page with a printed 
 or illustrated impression. 
 
 Las axemplaires originaux dont la couverture en 
 papier est imprimte 3ont filmte en commenpant 
 par le premier plat at en terminant soir par la 
 derniire page qui cnmpoRo une smpreinte 
 d'Impression ou d'iilustration, soit par le second 
 piat. salon le caa. Tous tee autres axemplaires 
 originaux sont filmte an commandant par la 
 premiere page qui comporte u.re smpreinte 
 d'lmpresaicn ou d'iiluatration et 9n terminant par 
 la ^erniire page qui comporte une telle 
 empreinte. 
 
 The laat recorded frame on each microfiche 
 shall contain the symbol —<»( meaning "CON- 
 TINUED"), or the symbol T (meaning "EhiO"). 
 whichever appiiea. 
 
 Mapa, platea. charts, etc.. may be filmed at 
 different reduction ratioa. Thoae too largo to be 
 enttraly included in one expoaure are filmed 
 beginning in the upper 'eft hand corner, left to 
 right and top to bottom, as many frames aa 
 required. The following diagrams illustrate the 
 method: 
 
 Un dee symboies suivants apparaitra sur la 
 demit^re image de cheque microfiche, selon le 
 caa: le symbols — •» signifie "A SUIVRE". le 
 symbols ▼ signifie "FIN". 
 
 Las cartes, planches, tableaux, etc., peuvent itre 
 filmis i dee taux de rMuction diffirents. 
 Lorsque le document est trop grand pour itn 
 reproduit en un seui cliche, il est film^ A partir 
 da Tangle sup^riaur gauche, de gauche i droite, 
 et de haut an baa. en prenant le nombre 
 d'images n^cessaira. Lea diagrammes suivants 
 illustrent la m^thode. 
 
 ita 
 
 lure, 
 
 3 
 
 3 
 
 2X 
 
 1 
 
 2 
 
 3 
 
 1 
 
 2 
 
 3 
 
 4 
 
 5 
 
 6 
 
 JL_^-.._-__... 
 
Al^ 
 
 — r-? -r 
 
 A'^^ 
 
 N65 
 
 i 
 
 / /■ 
 
 !) 
 
 (^From fJir Cinind'iiiu Xnfiinilisf. V<J. 7. .V". 3.) 
 
 // 
 
 Y" 
 
 I 
 
 DESCRIl'TIOXS OF NEW FOSSIl.S FllOM THE DE- 
 A'ONIAN JIOCKS OF WESTEILN ONTARIO. 
 
 J'.v U. Ai.i.KiNi: XiciKii.sd.v. A[,|).. D. ;<v.. .MA. '.IJ.S.i;. 
 I'l-dfes.-iiii- lit' Xntiir.il llistcvy in liil\ crsilx- (.'ii||cf>c. I'liroiito. 
 
 IIa\iiig bfL'U eiiua^vd lor m)ii;c liiiic in stiuljiii2 l\\v f'nssils of 
 the Coniifei'ous liUiu'j^toiio oi' W'^u-m Ontnrio, I i)iii'j)n.si' in tlit' 
 present t'ouiimuiication ta ,i;ivo brief descriptions of stime of the 
 new fofins whioli have come under my notice. I .^liall, however, 
 ,«iuiply uive the descriptionf'. without illustrations, as T am pre- 
 paring a detailed report ujioii the fossils of some of the P;dieozoic 
 formations of Ontario, in wliieli the sj)ecies in ((uestion will I 
 fully illui'trated. 
 
 »e 
 
 r. Z.MMIHKNTIS I'KNESTRATA. n. sp. 
 
 Corallum simpli'. eylindro-eonieal. curved. Tabula^ well de- 
 veloped, remote, luauling downwards as tliey ap})ro:ieli the outer 
 wall. Septa strong, t'lpially developed, not alternately large and 
 small, apparently forty-eight in nundtei'. Epithoea thin, with a 
 few shallow undulations of growth, but destitute of vertical 
 stria; or cost;e. 
 
 This species is clo.sely allied to Z. (jiii'intc'i, Lesueur, but ap- 
 pears to be clearly distinct ; though the above description is 
 founded upon but a .'ingle specinu'ii, which is all tliat I have as 
 yet obtained. It differs from Z. (figaiitcn in the greater pro- 
 portionate thickness, and much smaller number of the septa, 
 
and in tlie greater remoteness of the tubultt?. Thus in Z.gig'iii 
 ten tlio sept:i are from seventy to one liuntlred and forty in num- 
 ber, and they are alternately small and lartie; wiiilst their thick- 
 ness is not particularly ureat, and the distance between the 
 tabuhc is not excessive. Z. fenvstnitd is also a smaller form 
 than Z. (jigiinfrii. From Z. jjro/i/iai, BilliniiS, the present 
 species is distinguished by its greater size and more cylindrical 
 form, and the much smaller number of the septa, as well as by 
 the fact that the septa are not alternately of difterent sizes. 
 Z(ij)hn:iitts pnfiiht of Edwards and Ilaime, possesses forty equal 
 se'jiLi, but is of a much smaller size, and its shape is much more 
 tui-binate. Z. ccnfndi's, of the same authors, is also very much 
 more diminutive in its dimensions. 
 
 The tabulae of the circumference of the coral in Z./oiestrata, 
 where tliey bend downwards to meet the epitheca, appear to be 
 clearly of the nature of hifihly developed dissepiments ; since 
 they are not placed at exaf'.ly the same 'uwel in eontijiuous inter- 
 j<optal loculi. The specific name is in allusion to the peculiar 
 fenestrated appearance exhibited by portions of the coral from 
 which the epitheca has been removed, when the intcrseptal loculi 
 are seen to be crossed at intervals of from two to three lines by 
 the obli((uely descending; tabula), producing the appearance of a 
 series of oblong fenestrules. 
 
 Length of the only specimen observed live inches (real length 
 probably nearly twice as much) ; diameter of summit one inch 
 and a half. Caliee and fosette unknown. 
 
 Lorii/lft/ unJ /(irmnfioii. — C ;aferous limestone, Port Col- 
 borne. 
 
 Genus Bl-(»TIIR()1'I1YLLLM (Billings). 
 
 '• Corallum simple, turbinate or cylindrical. Internal struc- 
 ture consisting of a central area occupied by flat transverse dia- 
 phragms, an intermediate area with strong radiating septa, and 
 an outer area in which there is a 'set of imperfect diaphragms 
 projecting upwards, and bearing on their iipper surfaces rudi- 
 mentary radiating septa. A thin complete epithec:i, and a sep- 
 tal fosette." (Billings, Canadian Journ., New Series, Vol. IV., 
 p. 129.) 
 
 The central space of the theca is occupied in corals of this 
 gcnu3, as in Amplcxus, by flat or slightly flexuous tabula>, upoa 
 which the septa encroach slightly or not at all. Outside tnis 
 
3 
 
 centnil ;iiva is u narrow zone in wliicli tlio tabuliv; are bent ilown- 
 ward.s towards the b;ise of the eorallum, and are at the same 
 time occa«ionally split or bifurcati'il ; wliilst .lie continuity of 
 the spac s between tlieni is interfered with by a series of strong 
 septa. Outside this, ai^ain. is an outer ztnie fnnied by a series 
 of tabuho which are directed upwards and outwards in an arch- 
 in<r manner, and wliicli carry on tlieir upper surfaces a series of 
 imperfect septa, their h)wer surfaces being simply costate or 
 ridged. Lastly, the tabuho of this external zone are walled in 
 by a thin but strong epitheea. with which tlie outer surfiiee of 
 the coral is invested. 
 
 The genus ditters from Zuphrcntis in not having the septa 
 prolonged inwards to. or near to, the centre, and in having the 
 central tabulate a"e:i surrounded by an intermediate imperfectly 
 vesicular zone, surrounded in turn by an exterior zone of arched 
 tabulic and incomplete .septa. From Amp/ixiin it is distinguished 
 by the pos.session of the exterior zone last mentioned, and by the 
 septa being more largely developed ; whilst it is distinguished 
 from C/istiij).lii/ll(i)ii by tiie first of the above-mentioned peculi-^ 
 arities, am' also by the fact that the tabuhu of the central area 
 are nearly or (juite tl it. and are not elevated into a conical pro- 
 tuberance. 
 
 The genus Bhthrophi/ilinu was originally defined by Mr. 
 Billings (oy;. cit.), and tiie single species B. ihvjrtiattitiii was 
 described. In addition to this previously recorded and very 
 characteristic species, I have now to describe an allied form, />'. 
 upproxhnatiini, also from the Corniferous limestone of Western 
 Ontario. 
 
 II. Br.OTFlROl'IiVM.l M AI'I'ROXIM.VTIF.M, U. Sp. 
 
 Coralkim of unknown length, cylindrical or cylindro-conic;d. 
 The outer area consisting of strong arched diaphragms, curving 
 upwards and outwards, dist;inf from one another from half a 
 line to two lines, bearing upon their upper surface imperfect 
 septa which extend from one tabula to another when the tabuliu 
 are remote by the former distance only, but which otherwi.-e do 
 not do so. Septa alternately large and small, distant from one 
 another about a third of a line. Tabuhv of the central area 
 clo.sely approximated, from three to four in the space of two 
 lines, flat or slightly flexuous, the septa only slightly encroaching 
 on them. Kpitheca with numerous constrictions of growth and 
 
cnoirolirii:' ;innul:iUi>us, ns well as obscure longitudinal stria, 
 Diuicnsion^ unknown, but ccrtiiinly attaininu' a (liiinif'tcr of tliroe 
 indu's. 
 
 Tn most of its essential cluiraetors tins sjiccios aLirces with B. 
 (l.rnrfirafiiiii, Hillings, of wliicli perhaps it may turn out to be 
 only a variety. It is, however, distiniiuished by tlu; ajiparently 
 constant peculiarity that the tabuhf o|' the outer area are very 
 <-losely set, much more closely than iu /i. ilrror/icafum. Thus, 
 tyjiical specimens of the latter exhibit only from ihree to five of 
 the curved tabuljD of the outer area in the space of an inch ; 
 whereas examples of li. 'ipiimxihi'ifinii present no less tlian from 
 ten to fourtiHii tahuhe in tiie same sjuce. Whether this char:ic- 
 ter is one of specific value or not, may he (|uestioned, but 1 tliink 
 it advisable to refer the specimens which exhibit it, provisionally 
 at any I'ate. to a new species. 
 
 L(ii;il!t,i anil fnniiitflnu. — ( 'ornifei'ous liimestone nf I>nrt Col- 
 borne. 
 
 <;enus llKl.l()l'llvi.f,r.\i (Hall). 
 
 The ji'cnus //r/inj,hj///inii is very closely allied to ('i/nfliojJij/l- 
 /»//;. and the following,' are the definitions of it, uiven respectively 
 by Milne Kdwards and Ilaime, ami by Mr. Billings: 
 
 1. ••Corallum simple. Septal ajiparatus .veil developed, and 
 jiroducinii' lateral lamellar prolongations, which extend from tlie 
 Avail towards the centre of tlie visceral chamber, So as to repre- 
 sent ascending' arches and to constitute irreiiular central tahnhv, 
 and which are united towards the circumference by means of 
 vertical dissepiments."' (Milne Edwards and llaime.) 
 
 2. '•Corallum simple or auiiivgate ; radiating septa well de- 
 veloped, oblicjuely striated on their sides by tliin elevated ridge,s, 
 which extend from the outer wall in an upward curved course 
 t^)wards the centre. These ridges are connected by numerous 
 tliin lamiuiii, which divide the spaces between the septa into 
 SDiall sub-lenticular cells. The transverse diaphragms are thin, 
 flexuous, and confined to the central portion of the coral." 
 (Billings.) 
 
 The internal structure which distinguishes corals of the genus 
 Ilcliophifllam is thus of a somewhat complicated nature. The 
 septa are well developed and extend nearly or ({uite to the centre 
 of the theca, where they are often somewhat twisted; but there 
 is no columeiia. A central tabulate area exists, but is of com[)a- 
 ratively circumscribed dimensions. Kxternally to this tabulate 
 
i 
 
 area, tlic uiter.si'ptal loculi :iii' lUviilod into cells or siUiiU i-om- 
 partmi'iits by tlu' intersection of two sots of disseitiuients li;ivin<^ 
 (liti'eier.t <livi'eti(in>. The (lissi'jiiuients of the first :nul most con- 
 spiruous set are directed from the internal surface of the wall 
 obli(|Ueiy inwards and upwards towards the centre, in a succes- 
 sion of arches, the convexities of which are turned upwards. 
 These dissepiments tloubtle.ss coi-respond witii that circumferen- 
 tial portion of tlu' tabuhe. which is bent downwards towards the 
 base of the coral in species ui' Zd/ilinn/ts. Ch'tdophj/Hinii, l)i/)/ii/- 
 plii/lhnn, &c. When these dissepiments are more or less imper- 
 fect or have suft'ered destruction, they leave upon the Hat sur- 
 faces of the si'pta a correspondini:' nuudjer of arched .stri;e or 
 ridues. .Similarly, in the calice of tlii' coral these dissepiments 
 appear imi the free ediics oi' the septi; as so many short spines. 
 The dissepiments of the second series are more delicate, more 
 discontinuous, and much more variable in direction than tlio>e 
 of the preceding series. Sometimes they are nearly vertical, or, 
 in other words, arc pretty nearly cnnceiitrie with the theca. 
 Sometimes they are not far from the horizontal, and inter.seet the 
 dissepiments of the filrmei' series at a very acute angle. Most 
 commonly they are directed inwanU and downward;; from the 
 theca towards the centre, so as to cut tlie di.-.sepiments of tho 
 preceding series nearly at right angles. l>ecorticated examples 
 of /Iviio/t/ij///i(i)i exhibit a most characteristic appearance, due to 
 the intersection ot die septa and iilled-up intersejital locidi with 
 the dissepiments of the tir.st mentioned series. In this way is 
 produced a succession of vertical ridges and intervening sulci 
 crossed by numerous curved or sharply zigzagged encircling ridges. 
 The sj(ecies of I/i'tu>j)hi///i(r,i which have been di'scribed by 
 Mr. Billings as occurring in the I)evonian rocks of (\inada, are 
 II. /'Jrli'iisCj II. ('iijiiiijdiiixi'. 11. ( 'innnhiist. II. (.cnjiiinii, II. < 
 (■(lU'tij'ttiim, II. 11(1 Hi. and //. h'liiii.scpttitiint. the first tive from 
 the Corniferous hirmatiou. and the last two from the Hamilton 
 shales. All these, except //. tninlxciitutnin, have come under 
 my notice as occurring in the Corniferous Jjimestone of Western 
 Ontario, and I have also a single new form to record. 
 
 III. IlEr.lOl'IlVLM'M Coi.l'.OHNKNSK. 11. Sp. 
 
 Corallum simple, cylindrical, not expanding towards the cup. 
 8epta sixty at a diameter of one inch, carrying on their flat 
 surfaces arched stri;o at distances of from one-third to half a 
 
« 
 
 I 
 
 lino, Kpithoci with imnionms rouiulcd or j^Iiarp-cdg.-d imiiula- 
 tions and co.istricfiojis of -rowtl). A flat space at the boltom of 
 tho cup, to the centre of wliidi the ;H'pta extend. Cup deep; 
 fossetfo unknown. 
 
 ThLs species is nearly related to //. (',n/ii<j,U'»se md II. ('„i„t. 
 ih'iw', Billin-s ; but it is, T think, decidedly distinct. It is 
 distin-iished fron. //. CamulruHr by its cylindrical ru.d not 
 broadly-expandin- .sliape, the cup bein- ef|ual to or even less 
 than the dianu'ter of tlie coral at a point aj.parently a little 
 above the base ; by the flattening of the bottom of the calice ; 
 by the -reater closeness of the arched septal strijc ; and by the 
 Mnaller number of .septa. From //. Cai/mjmnsr the present 
 species is separated by its much smaller thickness, its cylindrical, 
 not expanding form, the smaller number <A' the sept:i, and the 
 closeness of the septal stri;c. 
 
 The length of //. Cofhoninisr must ]iav(! been ovt'r three or 
 four inches; but none of my specimens arc perfect. The di- 
 mensions of a broken indiv.dual are: length two inches and a- 
 half; diameter of broken base one inch; diameter of cup tea 
 lines ; depth of cup four lines. In another also broken .specimen, 
 the lengtli is two inches and a (juarter ; the diameter at the 
 broken base thirteen lines; the diameter of the cup (.ne inch; 
 and the depth of tlie cup five lines. Other example.s referable 
 to this .species exhibit a diameter of from an inch and a quarter 
 to an inch and a half 
 
 LocaVtt;/ mid Formation.— QoYnWaxoxxn limestone of Port Col- 
 borne. 
 
 IV. Pktkaia (?) LfxiA.Ni, n. sp. 
 
 Corallum .small, turbinate, more or less curved, almo.st trigonal 
 in transverse section, owing to its being flattened on the side of 
 the convex curvature, and also on the lateral surfaces. Septa 
 twenty-six or twenty-eight at a point a little above the base, but 
 sixty or more at the margin of the calice, the increase of number 
 being due to the bifurcation of each primary septum at a distance 
 of about a line and a-half above the base, and also to the inter- 
 calation of new septa along both sides of a line which runs along 
 the dorsal or convex side of the coral from top to bottom. This 
 line is marked on the exterior by two primary septa, which form 
 a prominent ridge externally and pass inwards to the centre of 
 the coral. At the margin of the cup the septa are somewhat un- 
 equally developed, being alternately larger and smaller, the 
 
larjrcr primary st'pta bcini; |.n.l.iii-od inwards to <1k< crritrc of 
 the tlifcii, where they become somewliat bent and twisted to- 
 gether. No columolla apiicars to be present, nor are there any 
 i-i/>i>fa. The flat sides ..f tbe septa are furrowed with a succes- 
 aion of deep grooves, about four or tive in the spuce of one Hue, 
 which are directed in an obIi(,uely asceudingand arehin,-: nianncr 
 from tlie wall towards the centre, the interspaces between tliem 
 bein- tumid and rounded, and thus impartin-;- a erenulated ap- 
 pearance to tiie outer edges of the septa when exposed to view. 
 These arching grooves are not connected with lamellar dissepi- 
 ments having a similar direction ; but the septa for some little 
 <listanee below the cup are united by delicate transverse dissepi- 
 ments. The epitheca is marked with a few annulatiuns of 
 growtli, wliieh are mostly very obscure, and with well marked 
 <;ost;e or stritc corresponding with the si'j)ta. 
 
 In none of the specimens in my possession does the epitheca 
 <'Xtend more than half an inch (often less) above the base of tlie 
 corallum. Beyond this point to the margin of the calice, the 
 edges of the septa are seen with their characteristic erenulated 
 appearance, and united here and there by minute dissepimer 
 As already noted, the flattened convex side of the coral alw ■ ' 
 <!xhibits two pre-eminently large septa, pro<luced by the bifui 
 tion of one, which run from the top to the bottom of tin? coral 
 a straiglit line. The remaining .sejtta are directed oblicpiely from 
 both .sides towards thi.s central pair ; so that new septa are inter- 
 calated along this line in proceeding from tlie base to the calice. 
 It is possible tliat these two septa may mark the position of a 
 fosette in the cup ; but none of my .specimens exhibit the inte- 
 rior of the calice, and I am, therefore, unable to speak positively 
 on this point. For the same reason I can say nothing us to the 
 <Jondition of the free edges of the septa internally. 
 
 The total length of the corallum is from three-<iaarters of an 
 inch to one inch,- the diameter of the calice varying from half an 
 inch to nearly three-(iuarters. The calice is oblique, so that the 
 greatest length of the coral is along its convex curvature! 
 
 Pet rot, I Logan i is closely allied to Pctntla {THrhiiiolopsii) 
 jphtnr<nU<dls, Phillips, with which I was at first sight disposed 
 to identify it. It is, however, readily distinguished by the flat- 
 tening of the convex curvature and lateral aspects of the coral, 
 and by tlie smaller number of radiating septa. As regards other 
 uiore minute characters, the published descriptions of /'. plari- 
 
I 
 
 nullans uw not .sufficient to cmi.-.1,1,. any closer comparison to be 
 J'i«tituU3(l with advfmta-o bvtwo-n thv two species. 
 
 There e.vists al.M, a .siii-uhir, .-md in .s(,n.c respects inexplicable 
 resemblance between the form lure dc-seribed under the name of 
 P. L<»j'n,;, and that de.^crib.-d by .Mr. Jjiljinus mnh-r the name 
 of n,hui,h,il....,u v.rii),n,m ((!an. Juurn. NVw Series. Vol. \. p. 
 2(51); atthe.^anie time that diirerences of such uravity e.xist 
 that the two forms cannot be united under the sam- spceitic 
 title, or e-en placed in the .same ^^enu.^. Without preten.linu' at 
 present to explain the discrepancies of ob.servation here allude.l 
 to. it may be as well to present in a summary forn. the points of 
 yyreement and difference wliieh appe.ir to exist between the two 
 species. 
 
 1. Ii..tli eo.als are of the .same ;veneral fi.rm and size, ar.d 
 occur not ..nly in the .same furmatiun, but al,s„ at the same lo- 
 cality. 
 
 '1. Hotii corals are alK-ed to po.sse.ss externally a couplr ,.f 
 strai-iht septal rid-es. extend in- from the top to the bottom of 
 the coral, and bavin- the other septa directed obli(,uely towards 
 tills line on both sides. I have, however, never been able to de- 
 tect this structure in the comparatively {\'ss .specimens which 
 have come un<k'r my notice, which I should feel di.spo.sed to 
 refer to 77. r.n't/iiiiiii. 
 
 H. The number of septa in the cup appciirs to be about the 
 same in both, th.m-h said t.. be .sometimes as many as ei-hty in 
 /A (.cu/,ntm, whilst they never apjM'ar to exceed sixt>-five in 
 J'. Ijcq'Dil. 
 
 Whilst the above are the chief points of a-rooment, tlu-e are 
 the follow in- i)oiuts of difference to be noted : 
 
 1. //. >:rij,inm. thou-h this i.s not specially alluded to, must 
 possess more or less well developed tahuhv. but no traces of such 
 structures can be detected in l\ Lxjani. in broken specimens or 
 in lon-itudinal sections, 
 
 2. The septa in //. e.ntjinm, exhibit on their fiat sidts *'al)out 
 six ob.scure arched stmr to one line." Tho.se of P Lmjunl ex 
 hibit a succes.sion of arched (//w,a.s- of ccisiderable depth, .sepa- 
 rated by somewhat tumid interspaces ; and these grooves are 
 only about four or Kve in tlie space of one line. Nor can it bo 
 supposed that this discrepancy is due to any confusion on njy 
 part between (x.s/.s of /*. I^mjanl and the actual coral itself, 
 such a mistake bein- impo.ssi}>le in dealin- with the well-pre.served 
 specimens of the Corniferous formation. 
 
9 
 
 ••}. Tl..> sopta in /'. Lny.n.l bUu,cato rcj^ularly in procrclin.^ 
 faun; the ba.c to the eup, thus b-in^ always arran,v.l i„ paivM ia 
 the upper part of the coral; whilst ..osuch arran,cn.cut is stated 
 
 4. Whon lookc-,! at a. .seen ,m transverse section, of the eup 
 the septa of //. ..o\,„um are seen to possess plain sid.>s, as is the 
 ci,.e ,n Zr,j>/,rn,tis ; whilst those of P. Lo;,nni ar. dentieulat^d 
 VMtl, to„th-l.ke .hssepiu.ents or spines, whieh rar'-ly extend to the 
 contiguous .septum. It need hardly b. .said that the .struetures 
 hero alluded to are not to be confounded with the spines whieh 
 oeeur on the /.. r./^rs of the septa of //. r.ny,nr,>, as in the 
 ;;enus i/r/h>j,/,,/f/„in in general. 
 
 r. The .pitheeu of //. ..riy.^nu is thiek, deeply aonulated, 
 hardly shov .^^ the lines of the .septa, and co-exten.Hive with the 
 outer surface of the c-ond. In />. L..;,„n., on the other hand, 
 the epuheca ,s .ery slightly marked with ridges of o,,nvth, usually 
 exhibits dLstina costjT). an.l never appears to extend to the mar- 
 frin of the cahce; thou-.h it is certainly difficult to say positively 
 whether this last a,,.pearanee is natural or is due to a partial de- 
 cortication of the coral. 
 
 I'l.on the whole, I think that the fo.ssil here de.^er! -d as 
 J'tnu'c L,„j.,nl fs distinct frompreviously known forms Its 
 rejerenee to Pr,,-.,;,, ,s provisional, but it apparently cannot be 
 re erred under any circumstances to the ocnus Ilrlloplmlhnn 
 1 have ..aiued it in honour of the eminent geolojrist, Sir William 
 JiOiian, F.B.S. 
 
 Umlit,, nml formation. -y^oixxmonnn.u in the Corniferons 
 Limestone of Kama's Farm, Port Colborne. 
 
 V. Al-cto (?) Canadknsis. n. sp. 
 
 Poly.oaryadnate, attached parasitically to the exterior of corals 
 branclnn- m an irre-ularly dichotomous manner. Cells in reality 
 un.scnal, but .«o disposed by the turnino. of each cell-mouth to 
 a ternate sides as to look as if bi-.serial. The t.uninal portion 
 of each cell bent outwards; the aperture circular. The cells 
 tubular, elo:.oated, .slightly or not at all expanded and not at all 
 elevated towards their apertures. Five cells in the space of two 
 Jines; width of cell about o,:e-fiftieth of an inch near the mouth. 
 
 I have considerable doubt.s as to the affinities of this extra- 
 ordinary little fossil ; but I think it is certainly one of the 
 Cyclostomatous }>olyzoa, and I see at present no better cour.se 
 
10 
 
 than to refer it to Alecfo, Lamoroux. When not cxauiincd closely, 
 the fossil presents a Striking re.scniblance to a SertuUirian Zoo- 
 phyte, exhibiting exactly the r,.pearauce of a number of tubular 
 calycles or cells springing alternately from the two sides of a 
 common canal or stem. When minutely looked into, however, 
 it is seen that this is deceptive, and that the fossil consists really 
 of an alternate or sub-alternate series of long, tubular, slightly 
 flexuous cellules, each cell being nearly cylindrical, and having 
 the terminal portion gcniculated or bent outwards, in such a 
 manner that the mouths of successive cells point in opposite 
 directions. 
 
 The difficulty in determining the systematic place of this fos- 
 sil is much increased by the fact that it occurs solely in the 
 form of casts, ramifying in the walls of moulds from which corals 
 have been removed, ft is, therefore, impossible to determine 
 what was the texture of the coenoecium, whether calcareous or 
 corneous ; whilst the lines of division between the cells, where 
 they come in contact with one another, are only very faintly and 
 obscurely indicated. The form of the aperture of the cell ap- 
 pears to have been circular, and its position terminal ; but some 
 uncertainty attaches to both of these statements. 
 
 Loadltji and Formation. — Common, growing parasitically 
 upon the corallites oi' BijiJu/jt/ii/llinn anriuUnacemn, or upon the 
 epitheca of FisfutiporK CinKnhnsiii, in the former position gene- 
 rally accompanied by a species of Sjth-oyhis. Corniferous Lime- 
 stone, Port Colborne, and Lot G, Con. 3, Wainfleet. 
 
 I 
 
 ! 
 
 I 
 
i 
 
 ! 
 
I