Troxell — Vertebrate Fossils of Bock Creek, Texas. 635 



Suidce. 



In the Mylodon-camel quarry at Rock Creek there were 

 two parts (fig. 24) of an animal allied to the modern peccary. 

 In some of the characters, especially the form of the cusps, 

 there is a resemblance to Dicotyles torqnaius. Most of the 

 fossil Suidae of the Pleistocene have been referred to the genus 

 Platygonus, especially to P. compressus, but Flower and Lyd- 

 ekker (5.291) state that : " Large peccaries also occur in the 

 Pleistocene of the United States, which, although they have 

 been referred to a distinct genus, Platygonus, on account of 



Fig. 24. 



Fig. 24. Platygonus compressus, fragment of ramus. 1, crown, 2, side 

 view; 3, tusk. Two-thirds nat. size. 



their relatively smaller incisors and somewhat simpler premo- 

 lars, may well be included in Dicotyles." 



The range of the ratios between the Rock Creek specimen 

 and one of P. compressus is very small, 125 to 136 per cent, 

 while there is a greater variation with the recent specimen of 

 Dicotyles torquatus. 



Platygonus, indigenous to North America, appears first in 

 the Middle Pliocene and disappears with the Equus zone of 

 the early Pleistocene. 



Testudinidce. 



Testudo, sp. ind. — The presence of a turtle in the quarry, 

 though giving no definite clue to the age of the beds, yet tells 

 us of undoubted river conditions. 



