326 



EVOLUTION OF THE HORSE. 



scent gland, similar to that found in several kinds of deer 

 and antelope. Had the H. gracile been the ancestor of the 

 horse, this depression would not have entirely disappeared in 



Fig. 192. — {After Gaiidry.) Front and Side View of 

 Left P'ore Foot of Horse Qth real length). 



2;;z, second metacarpal bone (inner splint-bone) ; yn, third metacarpal bone 

 (cannon-bone) ; ^m, fourth metacarpal bone (outer splint-bone) ; p', first phalanx 

 (long pastern bone) ; p", second phalanx (short pastern bone) ; /'", third phalanx 

 (pedal bone). 



the horse. The H. gracile does not appear to have left any 

 descendants. It is probable that the immediate ancestors of 

 the horse of to-day [Eqtms caballus) came, in prehistoric times, 

 from America, in which country are to be found the remains 



