F. B. Loomis — Turtles from the Upper Harrison Beds. 25 



offer no specific characters, unless it is that the tail was short 

 and weak. 



Testudo undabuna sp. nov. 



The type of this species (No. 2007 in the Amherst collec- 

 tion ) is a carapace, lacking the pygal and eleventh peripherals, 

 and the median portion of the plastron, the shell belonging to 

 a very primitive type of Testudo. It was found in the Upper 

 Harrison beds on Muddy Creek, Laramie County, Wyoming. 



The species is peculiar in having the suture between the 

 first and second costal plates start from the first neural plate, 



Fig. 9. 



Fig. 9. Carapace of Testudo undabuna as projected on a flat surface. % 

 nat. size. 



making it hexagonal, a condition paralleled among American 

 fossil turtles only in Testudo laticuneata from the Oligocene. 

 No neural plates are octagonal and only the third is tetragonal. 

 The surface of the carapace is covered by undulatory lines 

 which follow the outlines of the epidermal scutes. 



The carapace of the type is 205 mm long and 155 mm wide, the 

 outline of the shell being regularly ovate with a slight notch 

 in front, and unusually low vaulted for a land tortoise. The 

 dimensions of the neurals are given in the table below. 



