164 



COMPARATIVE ZOOLOGY. 



Fig.' 128.— Feet of Carnivores: A, Plantigrade (Bear); B, Pinnigrade (Seal)i C, 

 Digitigrade (Lion). 



some may be wanting, so that we have one-toed animals 

 (as Horse), two-toed (as Ox), three-toed (as Rhinoceros), 

 four-toed (as Hippopotamus), and five-toed (as the Ele- 

 phant). The Horse steps on what corresponds to the nail 

 of the middle finger; and its swiftness is conditioned on 

 the solidity of the extremities of the limbs. Horses of 

 the greatest speed have the shoulder-joints directed at a 

 considerable angle with the arm. 



in 



Fig. 129.— Feet of Hoofed Mammals: A, Elephant; B, Hippopotamus; C, Rhinoc- 

 eros ; D, Ox ; E, Horse, a, astragalus ; cl, calcaneum, or heel ; s, uaviculare ; b t 

 cuboides ; ci, cm, cuneiform bones ; the numbers indicate the digits in use. 



