Fig. 14. 



D. 



C. 



B. 



Fig. 14. — Increase in size of the Horse. 



A. The Eohippus, the smallest Ivower Focene horse known. 



B. The Orohippus, the Middle Focene horse. 



C. The MesoMppus, the Fower Olig-ocene horse, 4J4 hands high. 

 B. The HypoMppus or "forest horse." 



