108 VERTEBRATA : MAMMALIA. 



Anoplotherium, etc.,) we coine to the Hippopotamus fami- 

 ly, or Hippopotamidae, whose principal representative in- 

 habits the Nile and some other rivers of Africa. The 

 Hippopotamus has an exceedingly massive body, as large 

 as that of an ox, very short legs, large head, enormous 

 muzzle, small eyes and ears, and short tail, and very large 

 canine teeth. 



And lastly, we may merely mention the bristle-bearing 

 even-toed ungulates, as Hogs or Suidre, Peccaries or Di- 

 cotylidse, and their various allies all of which are hog- 



FIG. 117. 



Skull of the Wild Boar, Sus scropha, Linnaeus. 



like in their general appearance, and which have their 

 nostrils in the end of the snout, and the latter termi- 

 nating in a sort of disk or button well suited for rooting 

 or turning np the ground. 



Of the Perissodactyls, first on the list come the Equidse, 

 or Horse, Ass, Zebra, and their immediate relations ; 

 animals which have only one apparent toe and a single 

 hoof to each foot ; although, under the skin, on each side 

 of their metatarsus and metacarpus, there are spurs repre- 

 senting two lateral toes. 



All the varieties of our present horses are from a stock 

 indigenous to the Old World ; but bones of horses have 



