EXTINCT ANIMALS 

 its splint-bones, as the sole representatives of 



Fig. 93. — The liind- and the fore-foot of Hipjiarion, one of the 

 three-toed ancestors of tlie liorse. Tlie side-toes were 

 " pettitoes " and did not reach the ground. 



the two outer toes. Occasionally living horses 



13S 



