130 



THE WHITE RIVER BADLANDS 



the eyes there is a third pair serving as a sort of pro- 

 tective awning for the eyes. In front of these and slightly 

 nearer the median line of the face there is a fourth pair. 

 These are much less prominent than the others mentioned 

 but their presence is clearly indicated. Finally a fifth 

 pair, slightly more prominent than the last, but less promin- 

 ent and especially less horn-like than the others, is placed 

 at the side of the face nearly above the anterior molar tooth. 



Figure 66 — Fore and hind foot of Protoceras, the six-horned ruminant 

 of the Upper Oligocene, Scott, 1895. 



The head is long and narrow, tapering rapidly toward 

 the anterior end, where the muzzle becomes extremely 

 slender. The cranium is capacious and well formed. The 

 brain case is of good size and indicates a brain fairly well 

 convoluted, in fact the brain development of Protoceras 

 seems to have been more advanced than any other animals 



