EXPLANATION OF PLATE XIX. 



Figs. 1-4. PaLvEOSYOPS rAi.uDosu.s. 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, luuer view, natural size. Lodge-pole tr.ail. Dr. Carter. 



Fig. 5. Hyrachyus. Au astragalus. Natural size. 



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



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

 size. 



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



Fig. 9. Portion of a carapace of Tesludo nehrascensis, internal surface exhibitiug the ridge of attachment 

 of the neural sijines and the narrow costal cajjitula, natural size. 



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



Fig. 11. Sacral vertebrae of Clustcrnoit 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 Ti/losteus 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 Mississijipi, 

 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. Hadrodus priscus, 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 premaxillary bono, with two teeth. 



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

 cessioual teeth. 



Fig. ID. Lateral view. 



Fig. 20. Inferior view. 



Figs. 21, 22. EuMY'LODUS 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 xjcrspective. 



