PLATE XVII. 



BLAKCO EPOCH. 



Figure 1. Dibelodon tropicus, Cope; left mandibular ramus from outside; one- 

 half natural size. 



Figure 2. Dibelodon tropicus, Cope; first inferior true molar of left side from 

 above; 2a, same, inner side; both natural size. 



Figure 3. Dibelodon tropicus. Cope; first superior molar of left side from below; 

 natural size. 



Figure 4. Dibelodon humboldtii, Cuv.; first inferior molar of right side, figured 

 on Plate XVI, seen from above ; natural size. 



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