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Un dea symboles suivants apparaitra sur la demiAre image de cheque microfiche, selon le caa: la svmbole — «» signifie "A SUIVRE", le symbole T signifie "FIN". Maps, platea, charts, etc., may be filmed at different reduction ratioa. Tnoae too large to be entirely included in one exposure are filmed beginning in the upp^r left hand corner, left to right and top to bottom, as many framea aa required. The following diagrama illustrate the method: l.aa cartaa, planches, tableaux, etc.. pauvent *tre film*8 i dea taux de r*duction diff*rents. Lorsque le document est trop grand pour itre reproduit en un seul clich*. 11 est film* * partir d« I'angie sup*rieur gauche, de gauche i droite. et de haut an baa, an prenant le nombre d'Images n*ceaaaire. Lea diagrammes suivants illustrent la m*thode. 1 2 3 1 2 3 4 5 6 is Description of a New Species of Panenka from the Corniferous Limestone of Ontario. Note on the Occurrence of Paucispiral Opercula of Gasteropoda in the Guelph Formation of Ontario. By J. F. WHITEAVE8. I mmmmimmimmm •'%*■' UJ O z UJ o o a: 8 UJ (X. Z o O cc u. z DC O O co Q Z CC o < z UJ z < (0 i J o S " ReprinUd from the Canadian Record of Science, Dicnnher, 1891.' ex: o cc u. z tc o o o z (£ CD CO a z i(les, though porhapH alinortniilly so, Hubovato in marginal outline, about ono- third longer than high and highest poHtorioHy, tlio greutost height, exclusive of the beaks, being at or near the pos- terior termination of the cardinal border. Anterior side proc'uced and somewhat pointed, its outei- margin sloping obliquely and rapidly downward from the cai-dinal border above, and torming a rather narrowly rounded junction with the ventral margin below: posterior side about equal to the anterior in length, but broader in the direction of its height and much more broadly rounded at tho end : ventral margin moderately convex and most prominent posteriorly, nearly straight but ascending \Gvy gradually in the centre and anteriorly : superior border rcarly straight or but slightly convex on each side of the beaks, curving gradually and somewhat convcxly dowu- ward at each end, but rather moi-e rapidly so at the |>(»s- terior end than at tho anterior : iimbones obliiiue, : h>' , central: neaks curved inward and a little forwai . Surface maj-ked by from thii-ty-tiv(i to forty la and rounded radiating ribs, which are nearly st teriorly, but slightly curved in the centre and posic also by numej'ous and unequal concentric lines of growin. In some specimens an occasional intermediate anil veiy much smaller rib is developed between two of the larger ones. Characters of tho interior of the valves unknown. The figure on plate 1 is of the natural siise. The speci- men which it represents is the most perfect of tho right valves collected, and measures 16.2 cm., or six inches and four-tenths, m length, and lt».7 cm., or four inches and two tenths, in maximum Joight, inclusive of tho beak. It does not happen to show any of the smaller intermediate ribs nor the concentric lines of growth mentioned in thedesciip- tion of the species, these being seen in other specimens. The shell attains to a much larger size than the specimen figured, foi- an imperfect right valve collected by Mr. Lambo was probably a little ra )re than nine inches in 404 Canmliati Rpconl of Snence. lon;;lli, when ontire, and not fur from sevon "inches in il,> rntiximum height. Ottawa, October 9th, 1891. N'OTK ON THE OCCURRENCE OF PaUCISPIHAL Oi'ERcuLA OF Gasteropoda in the GirELPii Formation of Ontario P>v .1. F. WnrnsAVEH. ' Open uhi of yiistoiopoda appear to be of rather rare oecurretieo in the juiKuo/.oic rocks of Canada The best iviiown and earliei*t described are those of Madurea Loyani, from the Black River limeBtone of Pa(iuette'8 Kapiufj, on the Ottawa KMver, whi* li wore first described and figured b}- Sailor in 1851, in the first decade of "Canadian Organic Kemains." The operculum of this shell, which has for- tunately been found occupying its normal position in the aperture of the shell to which it belongs, is in many respects unlike that of any k?.' wn gasteropod, whether fossil or recent, both in its internal and external characters. It was described by Br. S. P. Woodward as " sinistrally subspiral, NOlid, with two internal projections for the attachment of mutjcles — one of them beneath the nucleus and very thick and rugose." A specimen of another species of Madurea, which han since bs en described and Hguj-ed under the name M. Mani- tobemis, with its operculum in place, was collected by Prof ir. Y. Tlind in the Trenton limestone at Punk Island, Lake Winnipeg, but this ojierculum is very imperfect and badly preserved. In 1874-8:i several solid, calcareous and multispiral oper- cula were collected by Mr. Joseph Towns- ^nd in th Guelph linje>tone at Durham, Ont., but none of these were found in situ. These opercula, some of which are described and illusiratcd in a report on the fossils of the Guelph fbrma- ' C,.iiiujiiiii«!utia \>y permission of the iJirector of the Geological Survey. I *t Paurispiml Oper^t/a of Gaatempoda. 405 *i tion ol' Ontario,' are circular in outline, their inner surface being flat, or nearly flat, and their outer Hurface convex. They vary cqnsidorably in the amount of their external convexity, some Doing nearly hennspherical and olherH conical externally, and probably belong to moie geneia than one. By anaU/gy with similar specimens that have been found in place, in shells of the genera Polytropis, De Koninck {=Oriosto7na, Munier Chalmas), and Ci/clonema, Hall, iu the Upper Silurii- rocks of (iothlanu, thoNC multi- spiral opercula from Durham are presumeri to belong to species of those genei-a, the Euomphalus macroUneatus of Whitfield, and the StraparoUus crenulatus of the present write*-, both of which occur ut Durham, being now known to be I'oferable to Polytropis, and tne genus Ci/rlonema U* Ite represented at Durham by t,ha (\ sulcatum of Hall, though this latter shell also may be a true Polytropis. Both Poly- tropis and Cydonema are referred by Lindstriim to the fam- ily T rbinidoe, partly because their shells " have retained the most evident traces of a nacreous layer," and partly on ai count of their solid calcareous opercula. About five or six years ago, a few opercula of an entiicly different character to any of those already mentioned were collected by Mr. Townsend in the Guelph formation at Durham. These, so far as the wi-iter has been able to ascer- tain, are so unlike any opercula that have hitherto been described as occurring in palteozoic rocks, that it is thought desirable to place a short description of them upon record. They are rather thin, nearly flat, but slightly concave exter- nally and as slightly convex internally, broadly subovate, about one-fifth longer than broad, obtusely pointed at the end corresponding to the posterior angle of the mouth of the shell whose aperture they closed, paucispiral and com- posed of from two and a-half to three rapidly expanding volutions, the nucleus being subcentral. Only the outer or concave surface nf each of these opercula is exposed to view, the inner side b€ ig buried in the matrix, Theaccompany- ' "tieological and Natural History Survey of Canada. Fahen/oic bVsils." vol. Ill, pt. 1, Montreal, 1884, |>. 33, pi. iii, figs. 10, 10«-6and U, and pi. vii, &g. 7, 406 Canadian Recofd of Science. in^ woodcut represents '.e exterior of the best specimen known to the writer, of natural size. Its maximum h>ngth is twenty millimetres and its greatest hi-eadth sixteen. Figure 1. Pnucispiral operculum of a gasteropod, genua and species unknown, from th(! Quelph Formation of Ontario. It is at present quite impossible to determine to which of the known gasteropoda from the Guelph formation in Ontario these opercula should be referred, if, indeed, they are referable to any. Judging by the shapes of the aper- tures of the shells into which they may have fitted, the most likely species, perhaps, are the Holopea gracia or H. harmonia of Billings, or a small and undescribed naticoid shell from Durham, which, so far as can be ascertained from a few casts of tne interior, seems to be closely related to the Hoiopea nux of Lindstrom, from the Upper Silurian of Gothland. The resemblance of the operculum here figured to that of Litorina and Natiea is ver}' striking, and in this connection it is to be noted that Lindstrom places Holopea in the Litorinidoe. In the recent species of Litorina the operculum is invariably chitinons and extremely thin while in Natiea proper it is calcai-eous and not nearly so thin. The one here figured is so highly dolomitized that it is difficult to estimate its exact thickness, but it gives the writer the impression of being thicker than that of a recent Litorina. At the distance of a millimetre from the edge, its thickness, at the somewhat truncated termination of the outer volution, is between one-half and three-quarte»'s of a millimetre, but it seems to increase rather rapidly in thickness inward. The onl}' other opercula known to vhe writer as occurring in the Paleozoic rocks of Canada are the depressed multi- Paucispiral Opercula of Gasteropoda. 40Y spiral ones of Euomphalus Manitobensis, one of which wuk obti,ined in place. These wei-e collected by Mr. J. B. Tyrrell, of the Geological Survey, in 1889, from limestones of Devonian age at Dawson Bay, Lake Winnipegosis, and are described and illuntrated in the eighth volume of " Transactions of the lioyal Society of Canada." Ottawa, October 24th, 1891.