. Carnegie Institution of Washington publication. 43° FOSSIL TURTLES OF NORTH AMERICA. This species differs from T. undata Cope in that the posterior peripherals do not have a strong recurvature outward and the internal thickening is much below the border joining the costal bones. From T. klrttiana, based on a pygal bone, it differs in not having the right and left borders parallel, but diverging upward. The upper border is notcht for the second supra- pygal. From T. orthopygia it differs in having a more elongated skull, a broader plastral lip, and the posterior peripherals less abruptly curv
. Carnegie Institution of Washington publication. 43° FOSSIL TURTLES OF NORTH AMERICA. This species differs from T. undata Cope in that the posterior peripherals do not have a strong recurvature outward and the internal thickening is much below the border joining the costal bones. From T. klrttiana, based on a pygal bone, it differs in not having the right and left borders parallel, but diverging upward. The upper border is notcht for the second supra- pygal. From T. orthopygia it differs in having a more elongated skull, a broader plastral lip, and the posterior peripherals less abruptly curved upward near their free border. The front of the plastron of the younger specimens of this species bears considerable resem- blance to the same part of T. niobrarensis figured by Dr. Leidy (Cont. Ext. Vert. Fauna West. Terrs., 1873, p. 225, plate iii, fig. 4). It appears however that the lip of Dr. Leidy's specimen projects farther beyond the points where the sulci on each side of the lip cross the border of the plastron, about two-thirds of the lip extending beyond these points. In the specimens of T. osborniana at least half of the lip is behind these points, and usually more of it. Only in the type specimen is there half of the lip in front ot the line joining the points referred to. In Leidy's species, moreover, the front border of the entoplastron falls behind the ledge formed by the lip; whereas, in T. osborniana the front of the entoplastron is slightly in front ot the ledge of the lip. Dr. Leidy's species almost certainly belongs to a different geological level. Of this fine species, which has been named in honor of Prof. Henry F. Osborn, of the American Museum of Natural History, there are, in the museum mentioned, specimens which give us a knowledge of the whole osteology and of various stages of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these il
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