PLATE IV. 



All figures natural size. 



Mastodon floridanus. 



Fig. i . First lower right premolar. 



Fig. 2. First lower right premolar. Outer view. 



Fig. 3. Second upper right milk molar, posterior portion. 



Fig. 4. Second lower left milk molar. 



Fig. 5. Third lower right milk molar. 



Fig. 6. First lower left premolar. 



Fig 7. First lower left premolar. Outer view. 



Fig. 8. First upper left premolar. 



Fig. 9. Second upper right premolar. 



Fig. 10. Portion of left maxilla of a young animal, showing the third milk molar 



and first premolar. 



Fig. 1 1 . Second upper right premolar. Outer view. 



Fig. 12. Third upper left milk molar, posterior portion. 





