. Carnegie Institution of Washington publication. Ti-:sTii|>iNiiK+:. 437 \l EASUREMENTS. Meter. Width-, proximal Width, distal 110 Length 110 Thickness 109 I he free margin is slightly convex. To this description it mav he added that the thickness of most parts of the hone is 20 mm. The free holder is acute; most so near the midline. 1 here is no satisfactory evidence that the bones which furnisht Cope's figs. 4 and 5, of the plate cited in the synonymy, belonged to this species. The form of the pygal, the lateral borders of which are parallel, appears to distinguish this species from
. Carnegie Institution of Washington publication. Ti-:sTii|>iNiiK+:. 437 \l EASUREMENTS. Meter. Width-, proximal Width, distal 110 Length 110 Thickness 109 I he free margin is slightly convex. To this description it mav he added that the thickness of most parts of the hone is 20 mm. The free holder is acute; most so near the midline. 1 here is no satisfactory evidence that the bones which furnisht Cope's figs. 4 and 5, of the plate cited in the synonymy, belonged to this species. The form of the pygal, the lateral borders of which are parallel, appears to distinguish this species from all others of our fossil species of Testudo. Testudo niobrarensis Leidy. I'''gs- 575-578. Testudo (Stylemys) niobrarensis, Leidy, Proc. Acad. Nat. Sci. Phila. 1858, p. 29; Extinct Mamra. Fauna Dak. and Nth., in Jour. Phila. Acad. Nat. Sci. Phila. (2), VII, 1869, p. 26. Testudo (Stylemys) niobrarensis, Hayden, Proc. Acad. Nat. Sci. Phila., 1858, p. 158. Stylemys niobrarensis, Cope, Ext. Batracli., Reptilia, Aves N. A., 1869, p. 124.—Leidy, 2d (4th) Ann. Rept. U. S. Geol. Surv. Wyoming, 1871, p. 366; Contrib. Extinct Vert. Fauna West. Terrs., 1873, p. 225, plate iii, figs. 4-6.—Hay, Bibliog. and Cat. Foss. Vert. N. A., 1902, p. 450. Testudo niobrarensis, Leidy, Contrib. Extinct Fauna West. Terrs., 1873, p. 340, plate xix, figs. 6, 8. This species was based on fragmentary bones which were collected by Dr. F. V. Hayden, in the year 1857, in what were regarded as Pliocene sands along the Niobrara River. These. Figs. 57,- 57S 575. Upper surface of plastron. X§. 570. Lower surface of plastron. Xjj. Testudo niobrarensis. Plastron, pygal, and suprapvgal. U. S. N. M. 577. Suprapygal and pvgal. Xi. Seen from above. 578. Section of pygal and suprapvgal. Xi. deposits are now regarded as belonging to the Loup Fork Miocene. No exact statement regarding the locality is given, but it was in all probability within the state of Nebraska. The specimens are in the U. S. National Museum, at Wa
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