PLATE XI. 



LOUP FORK EVOCIl. 



Dentition of species of Protohippus, natural size. 

 Figure 1. Protohi2^}nis ?parvulus, Marsh; superior molars. 

 Figure 2. Prutohippus ?pai-vulus. Marsh; part of lower jaw, from above. 

 Figures 3-8. Protohippus placidus^ Leiily ; lateral views, and a, grinding faces 



of molars. 

 Figures 3-5. Less worn molars. 

 Figure 5. Last superior molar. 

 Figures C-S. Molars presenting more wear. 



[112] 



