PLATE XXIV 



Fig. I 



Fig. 2 



Fig. I. Skull of Onohippidium ; pf, preorbital depression. 



Fig. 2. Crown surfaces of right upper molar teeth of Eqtius 

 (A and D), Hippidntm (C), and Hipparion (E). A and 

 B are almost unworn, a, anterior ; b. posterior pillar. 



