EXPLANATION OF PLATE XXXVIl". 



Figs. 1-3. AociiEXiA iie.sterna: 



Spceimeus from the Quaternary of California, and belonging to the cabinet of Wabasli 



College, Crawfordsville, Indiana. 

 Fig. 1. Outer view of tlie series of lower molar teeth of the left side, one-half the natural 



size. 

 Fig. 2. Triturating surfaces of the same series, natural size. 

 Fig. 3. A second upper molar of the left side, view of the triturating surface, natural size. 



Fig. 4. Bison: 



Last lower molar of the left side, triturating surface, natural size. Specimen fonud with 

 remains of Mcgalonijx Jeffersoiii, in Illinois. 



Fig. 5. AciiODU.s iiuMius. Magnifier; one and a half times. A'iew of the tritnrating surface of a tooth. 

 From the Cretaceous of New Jersey. 



Figs. G-12. I'.D.U'iioDox MiKiFicu.s. One-half the natural size. Specimens from the Cretaceous of New 

 Jersey, and belonging to the cabinet of Rutgers College, New Brnnswiek, New Jersey. 

 Fig. fi. Tlie mandibles seen on tlieir oralsurt^iee. 

 Fig. 7. Outer view of the left niandiljle. 

 Fig. 8. Inni'r vicT of the left mandible. 



Fig. 9. Posterior outline of the same, -witli outlines of the dental columns. . 



Fig. 10. The maxillaj seen on their palatine or oral surface. 

 Fig. 11. Outer view of the left nuixilla. 

 Fig. 12. Posterior outline of the same, with outlines of the dental eohunns. 



1 igs. V^, II. Ef.MVLODUS L.iQUKATL'.S : 



Left lower maxilla, one-half the natural size. 

 Fig. 13. Oral surface, exhibiting the dental tubercle. 



Fig. 14. Outer view. Specimen from the Cretaceous of Missi.ssippi, and discovered by Dr. 

 William Spilhnan. 



Fig. 10. PoXTOBASiLEU.s TUHEi;crLATU.s. Fragment of a tjoth, with restored outline, natural size. 



Figs. If), IT. M.VNATCS INOKN.VTITS. A lower right molar, natural size. From the phosphate beds of 

 Ashley Eiver, South Carolina. 

 Fig. 16. Upper view. 

 Fig. 17. Outer view. 



Figs. 18, 19. Pycxodus uobustus. Tooth of the natural size. 

 Fig. 18. Triturating surface. 

 Fig. 111. Posterior view. Specimen from the Cretaccons of Neu- .Jersey. 



