HISTORY OF THE fAMBLYPODA 449 



the fuintatheres may, in consequence, have been hairless, 

 but there is no evidence of this. 



Within the hmits of the fuintathere family, considerable 

 modification and change may be traced, which, as in the case 

 of the Proboscidea, principally affected the skull and the gen- 

 eral stature. It is hardly worth while to deal separately with 

 the two or more phyla which may be distinguished, for the 

 differences between them are relatively unimportant. In the 

 uppermost part of the Bridger stage almost the latest repre- 

 sentatives of the family are found and the genus {]Eohasileus) 

 was of the largest size. These animals had remarkably long 



Fig. 232. — Skull of \Elachoceras parvum (lower jaw restored). 

 Princeton University Museum. 



and narrow heads and very large, shovel-shaped nasal protu- 

 berances ; in the males the upper canine tusks were very long 

 and curved back nearly in a semicircle. In the middle portion 

 of the stage the species of ^Uintatherium were somewhat 

 smaller and had shorter, wider and higher heads, the tusks, 

 though well developed, were not quite so long, nor so strongly 

 recurved ; in some species they were nearly straight, with 

 "hastate" or spear-head point. In the same horizon is found 

 a third genus {^Elachoceras) which was probably a survival 

 persisting from the lower Bridger, in which none of these ani- 

 mals and little of anything else has yet been found. fElacho- 

 ceras was hardly half as large as the common species of fUinta- 



2g 



