List of Casts, Models, and Photographs. 2 7 



together after being positively determined as belonging to this 

 species, and as representing individuals of corresponding age. 

 The skeleton is thus believed to represent accurately the 

 original, and there is little restoration, except in the head of 

 the femur. This species is distinguished by the convexity 

 of the forehead, and by the low, flattened cones of the molar 

 teeth, and is not directly ancestral to the later Titanotheres. 

 Earle, On the gftrnxs^Palceosyops, etc., Jour. Acad. Nat. Sci. Phila., 1S92 



8. Phenacodus primaevus Cope. 



Am. Mus. No. 4369. 



This is the famous skeleton of Phenacodus found by Dr. 

 Wortman in the Lower Eocene of the Big Horn Basin, 

 Wyoming, and described by Cope in 'Tertiary Vertebrata' 

 and other publications. It here has an entirely different ap- 

 pearance, and gives us a different conception of the animal 

 from that presented in its original mounting. The skeleton 

 was very largel}^ embedded in the rock, and it required four 

 months of continuous work to remove the limbs, ribs and 

 vertebrae preparatory to remounting. The animal as figured 

 in 'Tertiary Vertebrata' appeared like a plantigrade; it was, 

 however, restored by Sir William Flower in his book upon the 

 Horse as a digitigrade. As here shown, the animal was as 

 digitigrade as the Tapir; the hind limbs are much longer and 

 more powerful than the fore; the tail is of great size. The 

 head, on the other hand, is extremely small, and out of all 

 proportion to the body. It is thus a microcephalic type, in 

 contrast ^'i^ki.Coryphodon, which is macrocephalic. 



Cope, Tertiary Vertebrata, pp. 428-463, pU. Iviift-lviii. 

 OsBORN, Remounted Skeleton of Phenacodus, Bull. Am. Mus. Nat. 

 Hist., X, 1898, pp. 159-164. 



9. Coryphodoa testis Cope. 



Am. Mus. No. 2865. 



Coryphodon is the characteristic large mammal of the Lower 

 Eocene or Wasatch. Its remains are usually found scattered. 



