322 



ORDERS OF MAMMALIA. 



ridges. The limbs are short ; the femur has a third troch- 

 anter ; and the feet are furnished with five digits each (fig. 

 625, B and c), all of these being functionally complete. 



Fig. ii-25. — A, Outline of skull and brain-cavity of Coryplioddii lunnntns, viewed from above, 

 one-fifth of the natural size ; b, Fore-foot of Coryplwdon, ojie-third of the natural size ; c, 

 Hind-foot of Conjjjhodun, one-third of tlie natural size. Lower Eocene, North America. 

 (After Marsh.) 



r 



Fam. 2. Rliinoceridm. — This family comprises only a single 

 living genus, the genus Rhinoceros, unless, indeed, the little 

 Hymx is to be placed here. The Rhinoceroses are extremely 

 large and bulky brutes, having a very thick skin, -which is 

 usually thrown into deep folds. The muzzle is rounded and 



blunt, and there are 



7—7 



7—7 



molars, with tuberculate crowns. 



There are no canines, but there are usually incisor teeth in 

 both jaws. The skull is pyramidal, and the nasal bones are 

 generally enormously developed. The feet (fig. G24, b) are 



