List of Casts, Models, and Photographs. 2>2> 



mounted the zebra-like proportions of this native American 

 wild horse, especially seen in the large head and deep jaws, 

 short barrel, small limbs and feet. 



GiDLEY, A new Species of Pleistocene Horse from the Staked Plains of 

 Texas, Bull. Am. Mus. Nat. Hist., XIII, 1900, pp. 111-116; and 

 Revision of American Species of Equus, ibid., 1901, XIV, pp. 91- 

 140. 



18. Amynodon intermedius 5. & 0. 



Am. Mus. No. 1931. 



Upper Eocene (Uinta) Utah. Found by A. O. Peterson, American 

 Museum Expedition, 1895. 



Amyiiodon was a collateral ancestor of the large Aquatic 

 Rhinoceros, Metaniynodon, of the Oligocene epoch, and is 

 largely intermediate, both in size and in characters of the 

 skull and skeleton, between it and the Middle Eocene Rhi- 

 noceros. This skeleton is mounted in high relief. 



19. Mastodon americanus {Kerr). 



Pleistocene Epoch, Newburgh, Ne\v York. 



Remains of Mastodon have been found in numerous locali- 

 ties scattered all over the Eastern States and Mississippi 

 Valley, and mounted skeletons are to be seen in several 

 American and European museums. This skeleton was found 

 in a peat bog near Newburgh, N. Y., and is one of the largest; 

 size, 9 feet high, 18 feet long as mounted. The Mastodons 

 differed strikingly from the Mammoths in proportions, as 

 well as in the number and character of their teeth, form of 

 skull and curve of tusks. 



20. Platygonus leptorhinus Williston. 



Pleistocene Epoch, Kansas. 



This skeleton is one of nine found together in Western 

 Kansas and described by Prof. Williston in 1894. The pro- 

 portions and pose of the skeleton at once suggest the living 

 peccaries {Dicotyles), from which Platygonus differed chiefly 

 in its larger size, more specialized feet and teeth. 



