. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 22 THE GENESEE CONODONTS traces of it have Ijeen found in these shales which preserve so beautifully the delicate tissues of plants and other fragile objects. In the present uncertainty, even as to the class of animals which bore these teeth, it seems to me advisable to retain Pander's generic names for forms described by him, and to restrict Hinde's genus Polygnathus to those crested crushing or tritoral plates so characteristic of his type specimen. The species figured herein on Plate III, figs. 3 and 5, differ
. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 22 THE GENESEE CONODONTS traces of it have Ijeen found in these shales which preserve so beautifully the delicate tissues of plants and other fragile objects. In the present uncertainty, even as to the class of animals which bore these teeth, it seems to me advisable to retain Pander's generic names for forms described by him, and to restrict Hinde's genus Polygnathus to those crested crushing or tritoral plates so characteristic of his type specimen. The species figured herein on Plate III, figs. 3 and 5, differ from Centrodus simplex and from the forms illustrated by Hinde, in that the base is more arched and rounded, and the teeth are shorter and more variable in size. From the Conodont l^ed in Eighteen Mile Creek. ^^^'s, «-,;V â¢â 'â¢4. Fig. 6. Centrodus princeps, Hinde. X 30. CENTRODUS PRINCEPS, HINDE Text Fig. 6. 1879. Polygnathus nrinceos. G. T. Hinde, Ouart. Tourn. Geol. Soc, Voi XXXV, p 365," P:ate XVI, fig. 23. For the rea:sons given above, I refer this species to Pander's genus Centrodus. It may even be a variety of his C. simplex, differing merely in the more robust and blunted denticles. Fig. 6 shows one end of a l)roken specimen ; Hinde's type lacks both ends. GNATHODUS AMERICANUS, Spec. Nov. Plate VII, fig. 5. This genus, transitional l)etween the narrow-based pectinate forms like Prioniodus and the broad-based tuberculated tritoral plates of Polygnathus, has hitherto l)een known by a solitary species described by Pander from the marl in the vicinity of Moscow. It illustrates the progressive adaptation of the basal portion of the plate into a grinding tritor. In Polygnathus this transformation is complete, the pectinate ridge either disappear- ing or being confined to a crest projecting beyond the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of t
Size: 1807px × 1383px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, books, booksubjectnaturalhistory
