August 30, 1894] 



NA TURE 



427 



r^-fi- 



L 



k 



¥ 



Fig. 1. — A i^-t-^raa^n of Hypsilophodon. 



•J 



,.,^'^^^<^ 



'/' 



NO. 1296, VOL. 50] 



(Phenacodiisj.i 

 Fig. a. — Ancestors of the Horse. Eocene Period. 



(Hyracothermm), 



