O. P. Hay — Fossil Turtles in the Marsh Collection. 273 



rounded behind. Over the limbs the peripheral bones are con- 

 siderably flared upward. The sutures separating the nuchal 

 from the first peripherals cannot be traced with certainty. 

 The greatest width of the bone is 175 mm ; and the length along 

 the midline, 150 mm . The first neural bone is oval; the second 

 and fourth, octagonal ; the third, hexagonal. The fifth was prob- 

 ably hexagonal, but it is somewhat crushed. • The sixth, seventh, 

 and eighth are approximately hexagonal. The anterior supra- 



pygal is bifurcate. The costals of the second, third, fourth, 



Figure 6.- 

 Figure 7.- 



■Testudo brontops. 

 -Testudo brontops. 



Diagram of carapace. 

 Diagram of plastron. 



fifth, and sixth pairs are alternately narrow and wide at their 

 proximal ends, and alternately wide and narrow at their distal 

 ends. The following table gives the dimensions of the costals, 



excluding the first 



Costal. 

 2 

 3 

 4 

 5 

 6 

 7 

 8 



Width at 

 proximal end. 

 56 

 100 

 56 

 94 

 61 

 40 

 43 



Width at 



distal end. 



106 



73 

 90 



56 

 95 



75 

 62 



The second and third vertebral scutes had a width of about 

 190 mm . The sulci of the region of the bridge ran in deep 

 valleys, thus giving a scalloped appearance to the border. 



