PLATE I.* 



Fig. 1. Amia exilis, Lambe ; dorsal vertebral centrum, articular face. Type. Page 12. 



Pig. 2. The same specimen from above. 



Pig. 3. Lateral view of the same. 



Fig. 4. Amia exilis, Lambe ; basi-occipital, superior aspect. 



Pig. 5. The same bone, viewed from below. 



Fig. 6. The same, posterior view. 



Pig. 7. Lepidosteus longus, Lambe ; vertebral centrum, superior view. Type. Page 13. 



Fig. 8. The same centrum, inferior view. 



Pig. 9. The same, lateral view. 



Pig. 10. Ehineastes rhceas, Cope ; pectoral spine collected by Mr. T. 0. Weston, inner view. 



Page 14. 



Pig. 11. Same specimen, outer view. 



Pig. 12. Same specimen, view from above. 



Pig. 13. ? Ehineastes rhmas, Cope ; fragment from distal end of spine 



Pig. 14. Rhineasles rhmas, Cope; dorsal spine, anterior view. 



Pig. 15. The same, posterior view. 



Pig. 16. The same, lateral view. 



Pig. 17. Anosteira ornata, Leidy ; marginal plate from the right side of the carapace, seen 



from above. Page 17. 



Pig. 18. The same plate viewed from below. 



Pig. 1 9. End view of the same. 



Pig. 20. Testudo exornata, Lambe ; distal half of left fifth costal plate, upper surface. Type. 



Page 18. 



Pig. 21. Testudo exornata, Lambe ; proximal end of left sixth costal plate, upper surface. 



Pig. 22. Testudo exornata, Lambe ; proximal end of left first costal plate, upper surface. 



Pig. 23. PeltosaurUs granulosus, Cope ; part of left dentary, interior view. Page 19. 



Pig. 24. Peltosaurus granulosus, Cope ; posterior half of right maxilla, interior view. 



Fig, 25. ? Peltosaurus granulosus. Cope; dermal scute, upper surface ; twice the natural size. 



Pig. 26. Ogmophis c'ompadus, Lambe; dorsal vertebra, superior aspect ; twice the natural 



size. Type. Page 20. 



Pig. 27. The same, anterior aspect ; similarly enlarged. 



Pig. 28. The same, posterior aspect; similarly enlarged. 



Pig. 29. The same, from below ; similarly enlarged. 



Fig. 30. The same, right lateral view ; similarly enlarged. 



* III this and the following seven plates all the figures are of natural size unless otherwise stated. 



