124 



FOSSIL TURTLES OK NORTH AMERICA. 



costal (fig. 130) and shows the scar for the articulation of the inguinal buttress. This fragment 

 is 91 mm. wide, 13 mm. thick at the sutural border, and 29 mm. thick through the ridge in 

 which is excavated the pit for the inguinal buttress. This pit is shallow and quite different 

 from that of any species of Taphrosphys, 



The sculpture of the anterior peripherals is obscure, due probably to weathering; that 

 of the hinder peripherals is more distinct. It is very different from that of Taphrosphys dares, 

 and consists of a pretty close network of rather broad grooves. On the costals the interven- 

 ing spaces are about as broad as the grooves and the latter run mostly parallel with the long 

 axis of the bone. 



FlGS. 131 AND 132. Amblypeza entellus. Known parts shown by stippling. 

 131. Restoration of anterior lobe of plastron, x}. 131. Restoration of hinder half of plastron of type. Xl. 



Appearances indicate that there was a nuchal scute about 60 mm. wide. If this be true, 

 the generic distinctions are strengthened. The sulci are, however, obscure. The first vertebral 

 scute extends much nearer the front of the nuchal bone than in any species of Taphrosphys. 

 At the midline the distance is only 20 mm. If there is a nuchal scute, the first marginal 

 measures only 64 mm. along the free border of the carapace. The width at the proximal end 

 is 24 mm.; at the distal end it has increast to 40 mm. The second marginal is 86 mm. long 

 and 60 mm. high at the middle of the length. The marginal lying on the supposed eighth and 

 ninth peripherals is 102 mm. long and 85 mm. high in front. On the supposed tenth 

 peripheral the marginal descended to within 42 mm. of the lower border of the bone. 



