INDEX. 



[The names of Cieiicra ami Species ilesci-ibed or characterized are in caimtali* ; tijose irioideiitally used are in Kciinan ; 



and synonymes are in italica.J 



Auluxodon, 51. 



Bootherium, 6. 



Bos latifrons, 51, 54. 



Cervus, 6. 



Chelonia Couperi, 54. 



Dicotyles, 55. 



Elephas, 55. 



Elephas primigenius, 6, 51, 54 



Equus, 55. 



Equus Americanus, 51, 54. 



Ereptodon, 4G, 58. 



Ereptodon priscus, 46, 58. 



tooth of, 46. 

 Euhradys antiqmts, 48, 58, 66. 

 Glossotherium, 58. 

 Gnathopsis, 14, 57. 

 Gnathopsis Oweni, 14, 41, 57. 



lower jaw of, 14. 



astragalus, 41, 

 Gravigrada, 57. 

 Harlanus Americanus, 54. 

 Hipparion, 55. 

 H3-drochcErus, 55, 

 Mastodon, 6, 54, 55. 

 Megalonyx, 3, 57. 

 Megalonyx, 58. 

 Megalonyx DissiMiLis, 17, 45, 57. 



teeth of, 45. 

 Megalonyx Jeffeusonii, 3, 17, 57. 



history, 3. 



materials for study, 4. 



description of the slcull, 8. 



lateral view of the slvull, 8. 



superior view, 9. 



inferior view, 10. 



posterior view, 11. 



anterior view, 1 1 . 



sutural connections of the bones of the skull, 

 12. 



comparison of the Megalonyx skull in Dr. 

 Dickeson's collection, with that of Dr. 

 Owen's collection, 12. 



comparative measurements of the skulls of 

 Megalonyx Jcfifersonii in the collections 

 of Drs. Owen and Dickeson, 13. 



inferior maxilla, 1 3. 



measurements of the lower jaw, 15. 



dentition, 15. 



measurements of the posterior fuiir superior 

 molars in tlie skull of Dr. Owen's collec- 

 tion, 18. 



measurements of the corrcspouding teeth in 

 the skull of Dr. Dickeson's collection, 18. 



structure of the teeth, 19. 



cervical vertebroc, 20. 



dorsal vertel)raj, 22. 



sacrum, 23. 



coccyx, 23. 



hyoid bone, 24. 



ribs, 24. 



scapula, 24. 



clavicle, 26. 



humerus, 26. 



bones of the forearm, 27. 



radius, 27. 



ulna, 27. 



carpus, 30. 



OS scapho-tra})ezium, 30. 



OS lunare, 30. 



OS cuneiforme, 31. 



OS pisifornie, 31. 



OS magnum, 31. 



OS unciforme, 32. 



of the carpal bones in conjunction, 32. 



metacarpals, 32. 



phalanges, 35. 



femur, 37. 



tibia, 38. 



