164: 



COMPARATIVE ZOOLOGY. 



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

 Digitigrade (Lion). 



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

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

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

 phant). Tiie 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. 



D E r-: 



Fl«. 129. —Feet of Hoofed Mammals: X, fflephant; B, Hippopotnmns ; C, Ebinoc 

 cros; Z), Ox! E, Horse, a, astragalas; el, calcanenm, or heelj «, uaviculare; b, 

 ' cnboides ; u, ei, cm, caneirorm bones ; the numbers indicate tlie digits in use. 



