LIST OF ILLUSTRATIONS. V 



Page 

 Fig. 22. — Left milk molars of Mastodon longirostris (Kaup), Upper 



Miocene, Eppelsheim, Germany . . . . . . . . 17 



23. — Vertical longitudinal section of molar of Mastodon angustidens 



(Cuvier), Middle Miocene, France .. . . .. ..17 



24. — Profile of left lower molar of Mastodon americanus (Cuvier), 



Pleistocene, North America . . . . . . . . 18 



25. — Skeleton of Mastodon americanrts (Cuvier), (reduced) ; Pleis- 

 tocene, Missouri ; North America .. .. .. ..18 



26. — Skeleton (restored and greatly reduced) of Mastodon clngus- 



tidens (Cuvier), Middle Miocene, France .. .. .. 19 



27. — Eight upper milk molars of Elephas primigenius (Blum.), 



Creswell Crags Cave, Derbyshire . . . . . . 20 



23. — Lower jaw of "Mammoth," Elephas primigenius (Blum.), 



Dogger Bank, North Sea . . . . . . . . 21 



29. — Profile of skull of Elephas ganesa (Falc. and Cautl.), Older 



Pliocene, Siwalik Hills, India . . . . . . . . 22 



30. — Profile of skull of Elephas planifrons (Falc. and Cautl.), Older 



Pliocene, Siwalik Hills, India. . .. .. .. ..22 



31. — Profile of skull of Mastodon sivalensis (Falc. & Cautl.), Older 



Pliocene, Siwalik Hills, India 22 



32. — Skeleton of the " Mammoth," preserved in the St. Petersburg 



Museum (discovered in 1806). . .. .. .. ..23 



33. — Upper and lower teeth of Cori/phodon hamatus (Marsh), 



Eocene, North America . . . . . . . . 25 



34. — Palatal aspect of skull of Cortiphodon elephayitopus (Cope), 



Wasatch Eocene, New Mexico, U.S.A. .. .. ..25 



35. — Restoration of Tinoceras ingens (Marsh), Eocene Tertiary, 



Wyoming, North America .. .. .. .. ..26 



36. — Skeleton of Phenacodus primvevus (Cope), Eocene, Wyoming, 



U.S. A 28 



37. — Skull and lower jaw of Typotherium crisiatum (P. Gervais), 



Pleistocene, South America . . . . . . . . 29 



38. — Modifications of the bones in the Perissodactyle fore-foot in 



Tapir, Rhinoceros, and Horse. . .. .. .. ..31 



39.— --Skull ar.d lower jaw of Rhinoceros leptorhinus (Owen), Pleisto- 

 cene, llford, Essex . . . . . . . . . . 32 



40. — Skull and lower jaw of Rhinoceros megalodus (Cope), Miocene, 



Colorado, North America . . . . . . . . 33 



41. — Upper left molars of Rhinoceros Croizeti (Filhol), Upper 



Eocene, Bach, France . . . . . . . . . . 34 



42.— Skeleton of Titanotheriumrobustum (Marsh), Miocene, Dakota, 



North America . . . . . . . . . . . . 35 



43. — Right upper molar of Chalic other ium sinense (Owen), Pliocene, 



China . . . . . . . . . . . . . . 36 



44. — Anterior and distal aspect of phalangeal bone of Chalicothe- 



rium siralense (F. & C). Siwalik Hills, India . . .. 36 



4S, — Palceotherium, Eocene, Montmartre (restored) .. .. 37 



