AET. 1-5 



PLEISTOCENE FOSSIL TURTLES — GILMORE 



carapace, both in front and behind, are very slightly flared upward, 

 and there is no lateral keel above the bridge, both features which 

 serve to distinguish it from the larger T. canaliculata Hay. A low, 

 flattened median keel traverses the first, second, and third vertebral 

 areas but is inconspicuously developed on vertebrals four and five. 

 The posterior peripherals are greatly thickened when compared with 

 such species as T. formosa Hay and the extant T. major., and rela- 

 tively thicker than the much larger T. canaliculata from these same 

 deposits. 



In the thickening of the peripherals this species resembles T. 

 innoxia Hay, as it does in the elongated shape of the carapace. In 

 size, however, it is fully twice as large as the type of T. innoxia. 



The sulci which separate the various scutes are deeply impressed 

 and thus clearly outline their respective boundaries. The vertebral 

 scutes reflect the elongate nature of the shell in being nearly as long 

 as they are wide. The form of these scutes is clearly depicted in 

 the illustrations, and their dimensions are given in the table below : 



Measurements of vertebral scutes 



' Estimated. 



Four extinct species of Terrapene have been recognized from 

 Florida; T. formosa Hay, T. innoxia Hay and T. canaliculata Hay 

 from the Pleistocene, and T. futnami Hay doubtfully from the 

 Pliocene. A fifth species, Tet^apene singUtani, here described, may 

 be at once distinguished from T. innoxia and T. formosa, in fact from 

 all other species with the exception of T. canaliculata and T. putnami 

 by its much larger size. From T. canaliculata, which it most nearly 

 resembles, it is distinguished by its smaller size, thinner shell, 

 absence of lateral keel above the bridges, relatively narrower cara- 

 pace, with greatest width at the middle, first vertebral widest at the 

 anterior end and with thickened posterior peripherals that are but 

 little flared upwards. 



