. Carnegie Institution of Washington publication. EMYDIDjE. 329 the other, is 56 mm. wide. A notch in the border produces a blunt tooth on each side. Bevond the notch the general curvature of the lobe is continued on to the midline. It remains to be seen whether this character will persist in additional specimens. Seen from above (fig. 430), the lip is 66 mm. wide from one gular suture to the other, and continues backward 32 mm. The entoplastron is diamond-shaped, 55 mm. long, 65 mm. wide and 11 mm. thick. It supports the hinder portion ot the gular scutes, but no part of the pectoral scutes.
. Carnegie Institution of Washington publication. EMYDIDjE. 329 the other, is 56 mm. wide. A notch in the border produces a blunt tooth on each side. Bevond the notch the general curvature of the lobe is continued on to the midline. It remains to be seen whether this character will persist in additional specimens. Seen from above (fig. 430), the lip is 66 mm. wide from one gular suture to the other, and continues backward 32 mm. The entoplastron is diamond-shaped, 55 mm. long, 65 mm. wide and 11 mm. thick. It supports the hinder portion ot the gular scutes, but no part of the pectoral scutes. The hvoplastra occupy 72 mm. of the midline; the hypoplastra, 93 mm.; the xiphiplastra, 78 mm. The hinder lobe of the plastron is 107 mm. long; its width at the base is 145 mm. The upper surface of the hvpoplastron (fig. 431) behind the inguinal buttress was covered with horny epidermis as far inward as the buttress extends, 31 mm. In all accessible specimens of E. wyomingensis this surface is much narrower. The inner edge of the inguinal buttress arises from the floor of the plastron at a line not half-way from the free border of the lobe to the midline, resembling in this respect E. luyomingensis. The gular scutes extend along the midline 42 mm.; the humerals, 42 mm.; the pectorals, 42 mm.; the femorals, 56 mm.; the anals, 55 mm. The species differs from all others of the genus, so far as known, in having the humero- pectoral sulcus cross behind the Figs. 432-435.—Echmatemys ocyrrhoe. Portions of type. 432. Carapace. Xi- 433. Plastron. Xj. 434. Upper surface of anterior lobe of plastron. X$. 435. Upper surface of inguinal region of plastron, showing base of inguinal buttress and free border of hinder lobe. Xj. Echmatemys ocyrrhoe sp. nov. Figs. 432~435- Two specimens in the American Museum of Natural History represent this species, No. 5933 and No. 5954. Of these, No. 5933 is taken as the type. It was collected in 1903 by Mr. Walter Granger in the Bridger Eoc
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