68 



INDEX. 



patella, 39. 



tarsus, 40. 



astragalus, 40. 



OS calcis, 41. 



OS scaphoides, 41. 



OS cuneiforme externum, 42. 



metatarsus, 42. 



phalanges, 43. 



development of ungual phalanges, 44. 

 Megalonyx Jejfersonii, 51. 

 Megalonyx laqueatus, Vl, 5'7, 58. 

 Megalonyx potens, 16, lY, 5T, 58, 62, 66. 

 Megatherium, 49, 58, 59. 

 Megatherium boreale, 5Y. 

 Megatheeitjm Cuvieri, 49, 58, 59. 

 Megatherium Jeffersonii, 5*?. 

 Megatheriitm mirabile, 49, 59. 



remains described by others, 50. 



remains in the National Institute collection, 5 1 . 



fragment of cranium, 52. 



hard palate, 52. 



lower jaw with teeth, 53. 



remains of, in the collection of the Academy 

 of Natural Sciences, 54. 

 Mylodon, 4T, 58. 

 Mylodon Darwinii, 58. 

 Mylodon Harlani, 4Y, 58. 



lower jaw, with teeth, 47. 



humerus, 48. 



young bones, 49. 

 Mylodon robustus, 58. 

 Onychotherium, 5T. 

 Orycterotherium Missouriense, 48, 58. 

 Orycteroiherium Qregonense, 58. 

 Pleurodon, 5T. 



SCELlDOTHERItJM, 14, 59. 



Scelidotherium Bucklandi, 59. 

 Scelidotherium Cuvieri, 59. 

 Scelidotherium leptocephalum, 59. 

 Scelidotherium minutum, 59. 

 Sus Americanus, 54. 

 Synopsis of genera and species, 57. 

 Tapirus, 6, 55. 

 Ursus, 6. 



PUBLISHED BY THE SMITHSONIAN INSTITUTION, 



WASHINGTON, D. C. 



JUNE, 1855. 



