MAMMALS. 



383 



ORDER X. UXGULATA (Hoofed Animals). 



To this order belong the great majority of important 

 mammals. They are herbivorous, usually of large size, 

 and lack collar-bones. The feet are used solely in walking, 

 and not in prehension, each toe having its tip enclosed in 

 a horny hoof, and in living forms there are never more 

 than four toes developed on a foot. The living ungulates 



FIG. 169. Sumatran rhinoceros (Rhinoceros sumatrensis). From Liitken. 



are arranged in two series, according to the number even 

 or odd of toes upon their hind feet. The odd-toed 

 forms are called PERISSODACTYLA, the even-toed are 

 ARTIODACTYLA. 



To the perissodactyls belong, of living forms, the tapirs, 

 rhinoceroses, and horses. The tapirs live in the forest 

 regions of the tropics of both continents. They have a 

 hog-like body, large prehensile upper lip; teeth, if, c\, 

 pmf, mf ; while their fore feet have four toes, the hind 

 feet three. Yet, although the fore feet have an even 

 number of toes, these are not symmetrically arranged, 



