272 



FOSSIL TURTLES OF NORTH AMERICA. 



of the skull. The shell of both specimens is quite complete. In neither is the front of the 

 plastron truncated. The length of the carapace of No. 5967 (plate 41, figs. I, 2) was originally 

 close to 430 mm.; its width about 330 mm.; but the shell has been strongly crusht down- 

 ward. The first vertebral scute has a width anteriorly of 80 mm.; the next three, each a width 

 of about 56 mm.; the fifth, a width of 128 mm. posteriorly. It will be observed that the last 

 of these vertebrals is considerably wider than in the Cope specimen. On the hinder half of 

 the carapace there is seen, on each side of the vertebral scutes, an indistinct flattened carina. 

 These correspond to the much more prominent lateral keels seen in the predecessor of this 

 species, B. tricarinata. 



The anterior lobe of the plastron is 100 mm. long and 152 mm. wide at the base. The 

 lateral borders converge in nearly straight lines to opposite the front of the entoplastron; 

 then they round rapidly to the midline. The entoplastron is large, 62 mm. long and 67 mm. 

 wide. The bridge is 117 mm. wide. The hinder lobe is 92 mm. long and 130 mm. wide at 



FIGS. 337 AND 338. Baptemys wyomingensis. Carapace and plastron. 



337. Carapace. XJ. No. 1494 A. M.N.H. c. p. 9, probable ninth pair of costal bones. 



338. Plastron and border of carapace. X/s- Specimen in Yale University. 



the base. As in other known specimens, the intergulars, gulars, and humerals appear to have 

 coalesct. The humero-pectoral sulcus crosses the entoplastron a little behind its middle, and 

 on the hyoplastron it turns abruptly forward and outward. The anal scutes measure 51 mm. 

 on the midline. Each of the other pairs measure about 62 mm. On each bridge there are 3 

 inframarginals, as in the type of the species. The hindermost one is no mm. long on its 

 outer border. 



The specimen numbered 5934 differs from the one just described in having the first 

 vertebral scute unusually wide, 125 mm. The lateral borders of the anterior lobe of the 

 plastron are not so straight as in No. 5967 and the extremity is slightly more pointed. The 

 inframarginals are as in the latter. This specimen shows well the buttresses. The axillary 



