EXPLANATION OF PLATE XIX. 



Figs. 1-4. PALiEOSYOPS paludosus. All half size except Fig. 4. 

 Fig. 1. Front view of the left femur. 

 Fig. 2. Lower extremity of the right femur. 

 Fig. 3. Distal extremity of the right humerus. 

 Fig. 4. The right patella, inner view, natural size. Lodge-polo trail. Dr. Carter. 



Fig. 5. Hyrachyus. An astragalus. Natural size. 



Fig. 6. Distal extremity of left femur of Testudo niobrarensis, one-half the natural size. 



Fig. 7. Distal extremity of right humerus of Testudo nebrascensis, from a young animal, half the natural 

 size.- 



Fig. 8. Distal extremity of the right humerus of Testudo niobrarensis, half the natural size. 



Fig. 9. Portion of a carapace of Testudo nebrascensis, internal surface exhibiting the ridge of attachment 

 of the neural spines and the narrow costal capitula, natural size. 



Fig. 10. Portion of right scapula of Testudo nebrascensis, hack view, one-balf the natural size. 



Fig. 11. Sacral vertebras of Chisternon.undatum, inferior view, natural size. 



Fig. 12. Lateral view of the same. 



Fig. 13. Ungual phalanx of an undetermined reptile, one-half the natural size. See page 285. 



Fig. 14. Dermal plate of Tylosteus ornatus, one-half the natural size. 



Figs. 15, 16. Pycnodus faba. Natural size. 



Fig. 15. Portion of a left ramus of the lower jaw, with teeth. The specimen from the Creta- 

 ceous formation of Mississippi. 



Fig. 16. Fragment of the left ramus of the lower jaw, with three teeth, from the greensand 

 of Crosswicks, Burlington County, New Jersey. 



Figs. 17-20. Hadeodus priscos, natural size. Specimen belonging to Dr. William Spillman, of Colum- 

 bus, Mississippi, and found by him in the cretaceous formation of that State. 



Fig. 17. Front view of a supposed promaxillary bono, with two'teeth. 



Fig. 18. Posterior view of the same, exhibiting at the sides the two reserve cavities for suc- 

 ccssional teeth. 



Fig. 19. Lateral view. 



Fig. 20. Inferior view. 



Figs. 21, 22. Eumylodus laqueatus. Mandible two-thirds natural size. From the Cretaceous forma- 

 tion of Mississippi, discovered by Dr. William Spillman. 

 Fig. 21. Inner view ; specimen reversed. 

 Fig. 22. View of the upper or triturating surface, with the inner surface in perspective. 



