. Carnegie Institution of Washington publication. THAI. ASSI MVDID^E. 149 have been taken from the plastron of one of the specimens desa ibed by him as O. emarginatus. Remarks on this specimen are made under the last-named species. In Cope's figure of" the plastron the hyoplastron on the left side of the drawing is placed too horizontally. The anterior outer angle ought to he directed strongly forward. This species resembles (). borealis. For differences see under the latter species. Osteopygis sopitus Leidy. Figs. 1X1-1S4. Chelone sopita, 1 EIDY, Smithson. Contrib. Knowl., \i\. 1Nn5, pp.
. Carnegie Institution of Washington publication. THAI. ASSI MVDID^E. 149 have been taken from the plastron of one of the specimens desa ibed by him as O. emarginatus. Remarks on this specimen are made under the last-named species. In Cope's figure of" the plastron the hyoplastron on the left side of the drawing is placed too horizontally. The anterior outer angle ought to he directed strongly forward. This species resembles (). borealis. For differences see under the latter species. Osteopygis sopitus Leidy. Figs. 1X1-1S4. Chelone sopita, 1 EIDY, Smithson. Contrib. Knowl., \i\. 1Nn5, pp. 104, 119.—Maack, Palajontographica, \\ in, 1869, pp. 2,;S, 283. Osteopygis sopitus, Hay, Bibliog. and Cut. Foss. Vert. N. A., 1902, p. 441 (in part). The type specimen of the present species has not hitherto been figured. It belongs to the New Jersey State collection and is at Rutgers College, New Brunswick, New Jersey, where the writer has examined it. Tins type consisted of 4 peripherals, but Leidy was uncertain whether or not thej belonged to one individual. These bones had been obtained in the Cretaceous greensand at Tinton Falls, Monmouth County, New Jersey, probably in the upper bed. Other specimens, which were mentioned by Leidy in his description of this species and figured, were afterwards referred by Cope to Lytoloma angusta, and probably correctly s sopitus. Peripheral of type. 181. Seventh: peripheral, with sei iS;. Hinder peripheral, with section (182^). The interrupted line of tin- section indicates the depth of the pit. iS;. Hinder peripheral. 1N4. Section of :i peripheral. Other specimens were referred by Cope to Leidy's species. One of these had been secured at Harrisonville, Salem County, [New Jersey, in a sort of limestone. This specimen is now in the American Museum of Natural History and has the number 2361. Almost certainly it is not a species of Osteopygis, and it has in the present work been referred provisionally to Rhetechelys platyops (Cope).
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