List of Casts, Models, and Photographs. 43 



those of the primitive horses. Hence the motion character- 

 istic of the gaUoping horse is given to the skeleton. 



Originally reproduced by Osborn in the Century Magazine, September, 1S96. 



Scott, Osteologie von Hyracodon Leidy, Festsch. f. Gegenbaur, 1896, 



PP- 353-383. pll- i-iii- 



10. Mesonyx, Omnivorous Middle Eocene Credont. 



This huge animal is represented preying upon the skull of an 

 Uintathere, in order to give some conception of its size. The 

 skull, as represented in the American Museum Collection, No. 

 1892, is extremely large and armed with very blunt teeth, 

 wearing down in old age, indicating that the animal was omniv- 

 orous, or lived partly upon turtles or decaying animal food. 

 The form of this body is derived from a complete skeleton in 

 the Princeton Museum, which has been figured by Scott. It 

 slopes backwards, the posterior quarters being rather small; 

 the tail is extremely long and powerful, the general propor- 

 tions resembling somewhat those of the Tasmanian Wolf. 



Originally reproduced by Osborn in the Century Magazine, September, 1896. 



ScoTT, New and Little-known Creodonts, Jour. Acad. Xat. Sci. Phila., 



IX, 1887, pp. 155-185, pU. v-vii. 

 WoRTMAN, Studies of Eocene Mammalia in the Marsh Collection, Part 



I, Carnivora, Am. Joum. Sci., XII, 1901, pp. 285, 377, 421; XIII, 



1902, p. 39. 



II. Palaeosyops, Eocene Hornless Ancestral Titanothere. 



This animal is based upon the complete skeleton mounted in 

 the American Museum, and is represented as having somewhat 

 the habits of the Tapir, hving in low, marshy land, and feeding 

 entirely upon the softer kinds of leaves and grasses, since its 

 teeth are entirely unadapted to hard grasses or the more 

 siHcious plants. According to the studies of Earle, the ani- 

 mal was devoid of a proboscis, but had an elongated, pre- 

 hensile upper lip. The slender fore feet are very similar in 

 proportions to those of the aquatic Rhinoceroses. 



Originally loaned for reproduction in Harper's Magazine, 1897. 

 E.^RLE, On the genus PalcBOsyops, etc.. Jour. Acad. Nat. Sci. Phila.. 

 IX., 1892, pp. 267-388, pll. x-xiv, and restoration, p. 314. 



