PLATE XVT. 



BLANCO EPOCH. 



Figure 1. Dihelodon tropicus^ Cope; part of mandible from above, one-half 



natural size; la, last molar tooth seen directly on upper surface, partly 



from inner side of ramus; same proportion. 

 Figure 2. Dihelodon humhoMtii, Cuv.; ? last deciduous molar, grinding face; 



natural size. 

 Figure 3. Dihelodon humholdtii, Cuv.; first inferior molar of the right side from 



within; 3a, same from without; both natural size. 

 Figure 4. Dihelodon humholdtii, Cuv.; second superior true molar of the left 



side, natural size, from below. Found separately. 



[122] 



