PLATE 22. 



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24. 



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Pine Ridge Escarpment at the Nebraska- Wyom- 

 ing State Line. 

 Fig. 1. Cattle Descending a Badland Hillside. Fig. 



2. The 6 L Ranch near Imlay. 

 Restoration of Hyaenodon. 



Fig. 1. Head of Dahoenus felinus. Fig. 2. 

 Skeleton of Daphoenus felinus. 

 26. Fig. 1. Head of Hoplophoneus primaevus. Fig. 



2. Head of Syndoeeras cooki. 

 2j. Restoration of Hoplophoneus primaevus. 



28. Skeleton of Caenopus tridactylus. 



29. Restoration of Metamynodon planifrons. 



30. Group Restoration of Metamynodon, Hyracodon 



and Dinictis. 



31. Fig. 1. Head of Mesohippus bairdi. Fig. 2. Head 



of Hyracodon nebrascensis. 



32. Restoration of Mesohippus bairdi. 



33. Fig. 1. Illustration to Show Evolution of the Fore 



Foot in the Horse Family. Fig. 2. Right Hind 

 Foot and Left Fore Foot of Mesohippus inter- 

 medins. 



34. The Evolution of the Horse. 



35. Skeleton of the large Titanothere, Megacerops 



robustus. 



36. Fig. 1. Right Hind Foot of Titanothere. Fig 2. 



Right Fore Foot of Titanothere. Fig. 3. Right 

 Hind Limb of Titanothere. 



37. Skull of Titanotherium ingens, Viewed from Above. 



38. Fig. 1. Upper Teeth of Titanothere. Fig. 2. 



Lower Jaw of Titanothere. 



39. Restoration of Titanotherium (Brontops). 



40. Group Restoration of Brontotherium gigas. 



41. Skeleton of Elotherium (Entelodon) ingens. 



42. Group Restoration of Elotherium (Entelodon) 



imperator. 



43. Fig. 1. Head of Oreodon (Merycoidodon) gracile. 



Fig. 2. Head of Oreodon (Merycoidodon) 

 culbetsoni. 



44. Fig. 1. Skull of Eporeodon major. Fig. 2. Left 



Half of Skull of Eporeodon major as seen from 

 Above. Fig. 3. Right Half of Skull of Eporeo- 

 don major as seen from Below. 



45. Skeleton of Protoceras celer. 



