PLATE rX. 



LOUP FOUIv KPOCII. 



Grinding faces of molar teeth, natural size. 

 Figure 1. Protohippus mirahilis^ Leidy; specimen figured on Plate V'lll. 

 Figure 2. Protohippus pachy ops. Cope; specimen figured on Plate IX, sui)0- 



rior molai-s. 

 Figure ?>. Protoh.ippn,s pachyops. Cope; inferior molars of specimen represented 



in last figure. 



[108] 



