XVI.] 



FERISSODACTYLA. 



295 



The second and fourth toes may be subequally developed, as 

 in the Rhinoceros (Fig. 100), or they may be represented 

 only by mere splint like rudiments of their metacarpals, as in 

 the Horse (Fig. 101). All intermediate conditions are met 

 with in various extinct forms, as Palaotherium, Anchitherium, 



F,G. 99. 



FIG. loo. 



FIG. 101. 



FIG. 99. Bone* of the manus of Tapir (Tapirus indicus), {. 

 FIG. loo. Bones of the nianus of Rhinoceros (Rhinoceros sHinatrrnsis), \. 

 Fi<;. tot. --Bones of the manus of Horse (Equus catalius), J. Hand iv rudimentary 

 metacarpals. 



and Hipparion. In the Tapir (Fig. 99) there are four 

 complete toes, in consequence of the fifth being developed, 

 though it scarcely reaches the ground in walking. In other 

 respects the foot resembles that of the Rhinoceros, the third 

 toe being longest, and symmetrical in itself and having on 



