VERTEBRATA 185 



snout, which is large and fleshy. The living representa- 

 tives are the manatee, of both sides of the tropical Atlantic 

 Ocean, and the dugong of the East Indies (Fig. 270). 



4. Ungulata, or hoofed quadrupeds. This large 

 order, comprehending many animals most useful to 

 man, is distinguished by four well-developed limbs, each 

 toe being generally encased in a hoof (Fig. 300). The 

 leg, therefore, has no prehensile power ; it is only for 

 support and locomotion. Clavicles are wanting ; and 

 the radius and ulna are so united as to prevent rotation 



FIG. 173. Indian rhinoceros (/?. indicus). 



(Figs. 314, 316). There are always two sets of teeth, 

 i.e., milk teeth are succeeded by a permanent set. The 

 grinders have broad crowns (Figs. 234, 308). As a rule 

 all are herbivorous. The brain is always convoluted, 

 but the cerebellum is largely uncovered (Fig. 335). 



Ungulates are divided into two groups: those in 

 which the feet are always digitigrade, with never more 

 than four functional digits, as the horse, ox, and rhinoce- 

 ros; and those in which the feet may be plantigrade with 

 four or five digits, as the cony (Hyrax\ of Syria, and 

 the elephant. The dental formula of the horse is 



