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Tous les autres exemplaires originaux sont filmte en commenpant par la premiire page qui comporte une empreinte d'impression ou d'illustration et en terminant par la derniAre page qui comporte une telle empreinte. Un des symboles suivants apparattra sur la dsrniire image de cheque microfiche, selon le cas: le symbole — ► signif ie "A SUIVRE". le symbole V signifie "FIN ". Les cartes, planches, tableaux, etc.. peuvent Atre filmAs A des taux de reduction diffArents. Lorsque le document est trop grand pour Atre reproduSt en un seul clichA. il est filmA A partir de I'angle supArieur gauche, de gauche A droite, et de h&ut en bas, en prenant le nombre d'images nAcessaire. Les diagrammes suivants illustrent la mAthode. 32X 1 2 3 6 OCT 31 1933 en .V\cG ^"^ /S-S"f, ^^ ON A NEW GENCS OP SILICEOUS SPONGES FROM THE TRRNTON FORMATION AT OTTAWA. Bv GEOKGE JENNINGS HINDE, Pn.D. pipn" it i ' .^ i- SPONGES FROM THE TRENTON LIMESTONE AT OTTAWA. 1 )• I i L. M. I.AM8E. Oik. V. [Reprinted from Thk Canadian Rkoord ok SctKNcu, July, 1(«9.J On a New GtEnus of Siliceous Sponges prom THE Trenton Formation at Ottawa. By George Jennings Hinoh, Ph.D. [Plato D.] The Canadian Geological Sui-vey, through Mr. J. F. WhiteavoH, F.G.S., has lately forwarded to me, for examina- tion and description, a small collection of fossil spongCH which has been obtained by Mr. W. E. Billings from the Trenton Formation at Ottawa. The rarity of these organ- isms in this geological horizon rendei-s a special interest to their study. The forms obtained are, for the most part, un- attractive in outward aspect, showing little more than their cylindrical or compressed outlines ; and their real charac- ters, whether sponges or mere inorganic nodules, cannot in all cases be known until sections have been made. These show that the sponges are now completely filled up by the dark limestone matrix of the rocks in which they occur, which renders it very difficult to make out the direction of the canals which traversed their walls. Sometimes, how- ever, transparent calcite has partially occupied the canals. The delicate spicular network of which the sponge-skeleton is composed, has also been largely destroyed in the fossili- zation, and the portions which remain have quite lost their original siliceous structure, and are now replaced by crys- talline calcite. The effect of this change has been that the definite foi-m of the individual spicules and their mode of union with each other, can no longer be recognized, and thus render their determination somewhat uncertain. In spite of these hindrances to a precise diagnosis, I venture to describe these forms as a new genus of Lithiotid sponges, for which I propose the name Steliella\ Steliella, g. n. Generic characters. — Sponges simple, suboylindrical, com- pressed, club-shaped or occasionally funnel-shaped, appar- ^ ar^^Ti, an upright stone or post, dimin. , ♦• * • '.. • ••.■>. » t . T • • • '. • • • • > •• • .«!•• •! • •••»,' ••■»• ..« ••• ••• • • :; • . t* • •• » • •• 396 Canadian Record of Science. ently free. Walls thick, a cloacal depreHsion at the Bum- mit, whioh maybe extended downwards as an open tube. The outer Burface of the wall with circular canal aperturen diw- posed in longitudinal row8. There are two Hcries of canals ; a larger whioh traverses the walls in a generally vertical or oblique direction ; and a smaller which extends from the surface in an arched direction to the interior of the sponge wall. The skeleton consists of a connected spicular raesh- work, apparently of tha Anomocladina type, in which there is a relatively small central node with a variable number of rays which connect with adjoining nodes. No distinctive dermal layer is present. The spicular structure of this genus is nearest allied to that of Astylospongia, F, Eoemer, but the nodes are less de- veloped, and the network is much less regular. Owing to the manner in which the spicules are replaced, and their coalescence, it is impossible to make a close comparison with other sponges, and, in fact, it is difficult to state posi- tively whether the spicules are uniformly of the Anomocla- dina type. The canal apertures of the surface, and the shape of the sponges as well, resemble some forms of Caki- thium, Bill., such as C. Anstedi' and 0. Fittoni, ' but the spicu- lar structure in these latter is as yet unknown, and there- fore they cannot properly be compared with Steliella. Steliklla BiiiLiNGSi, sp. n., pi. FigB. 1-4. Sponges subcylindrical or compressed so as to be nearly elliptical in transverse section, or club-shaped ; the basal end obtusely rounded and apparently free, The specimens vary from 28 to 64 mm. in length, aod from 14 to 34 mm. in thickness. The vertical rows of canal apertures are about 1 mm. apart, the apertures themselves, in the single specimen in which they are clearly shown, are circular or ovate and about 1 mm. in width. The larger canals, as shown in transverse sections, ai-e from 0.5 to 1 mm. in width, those of the smaller aeries are from 0.2 to 0.3 mm. » PaL Fob., vol. 1. p. 210. lb., p. 211. » • ' » t • • Neu) Genus of Siiu:mus Sponges. 89t wide. The skelclon of the BpongOB haH the appearance in thin HoctionH of a minute Htollate network, the central no ATranBVo^o section from the centre of the same specimen '• ^holTtrarrangement (in section) of the largo canals- Fig. a."" Thrluier surface of another si^cimen showi.g tho canal aiiertures. Natural size. Fig, 4. A portion of the spicular mesh, as seen in a thin micro- Bcopic section. Enlarged sixty diametres. Figs. 5-6. Steliella craasa. I r t *„ * f MHi ■gi.:- .^: