ILLUSTRATIONS. 



List of "Woodcuts. (Original.) Page 



Figure 1. Outline of skull and brain-cavity of Hesperomis regalis, 9 



" 2. Outline of skull and brain-cavity of Colymbus torquatus, 9 



" 3. Cast of brain-cavity of young Alligator, 9 



" 4. Vertical section of tootb of Hesperomis regalis, 15 



" 5. Horizontal section of same tooth, 15 



" 6. Tooth of Hesperomis regalis, 15 



" 7. Tooth of Mosasaurus princeps, 15 



" 8. Thirteenth vertebra of Hesperomis regalis, 35 



" 9. The same vertebra, posterior view, _ 3.3 



" 10. Fifteenth vertebra of Hesperomis regalis, 39 



" 11. Sixteenth vertebra of Hesperomis regalis, 41 



" 12. Seventeenth vertebra of Hesperomis regalis, 43 



" 13. Transverse vertical section of twentieth vertebra, 49 



" 14. Scapular arch of Hesperomis regalis, 58 



" 15. Sternum of Emeu (Dromaius JYovos-Hollandios), 60 



" 16. Pelvis of Emeu, 71 



" 17. Pelvis of Grebe (Podiceps occidentalis), 71 



" 18. The same, seen from above, ._.. 71 



" 19. Pelvis of Geocoecyx Calif omianus, 73 



" 20. Pelvis of Tinamus robustus, 73 



" 21. Twenty-fourth vertebra of Hesperomis regalis, 74 



" 22. The same vertebra, posterior view, 74 



" 23. Caudal vertebrse of Hesperomis regalis, 86 



" 24. Transverse section of femur of Hesperomis regalis, 88 



" 25. Transverse section of same, 88 



" 26. Transverse section of tibia of Hesperomis, 91 



" 27. Transverse section of same, 91 



" 28. Quadrate bone of Ichthyornis victor, 121 



" 29. Outline of skull and brain-cavity of Ichthyornis victor, 122 



" 30. Outline of skull and brain-cavity of Sterna cantiaca, 122 



" 31. Scapular Arch of Ichthyornis victor, 143 



" 32. Twelfth cervical vertebra of Ichthyornis dispar, 180 



" 33. The same vertebra, seen from the side, 180 



" 34. Third cervical vertebra of Ichthyornis victor, 180 



" 35. Thirteenth cervical vertebra of Hesperomis regalis, 180 



" 36. The same vertebra, posterior view, 180 



" 37. Tarso-metatarsal of Haptomis advenus, 193 



" 38. The same bone ; side view, 193 



" 39. The same bone; back view, 193 



'•' 40. Atlas of Hesperomis crassijies, 196 



