List of Casts, Models, and Photographs. 



-'0 



Eocene) in 1S73, and was mistakenly referred by him to H. 

 eximius. It was mounted as found, with an incomplete skull 

 and so figured by Cope in ' The Tertiary Vertebrata.' The 

 American Museum Expedition of 1893 secured a complete 

 skull belonging to this species, and of the proper size, which 

 has been affixed to the skeleton. In order fully to expose the 

 bones, and correct several errors in the original mounting, the 

 entire animal was taken apart and remounted, as here photo- 

 graphed. The animal was about as large as a sheep, and is 

 the oldest known type of Rhinoceros, more directly ancestral to 

 the Hyracodon or Cursorial Rhinoceros of the Oligocene. 



Cope, Tertiary Vertebrata, U. S. Geol. and Geog. Sur. Terr's, T. V. 



Hayden in charge, Final Report, Vol. IV (1885), pp. 657-677, pll. 



liv, Iv, Iva, etc. 

 OsBORN & WoRTMAN, Perissodactyls of the White River Beds, Bull. 



Am. Mus. Nat. Hist., VII, 1895, pp. 367-371. 



4. Patriofelis ferox {Marsh). 



Am. Mus. No. 1507. 



This animal was originally described by Leidy from a frag- 

 ment of the lower jaw. The American Museum Expedition 

 of 1893 procured the complete skeleton, represented in two 

 different animals, in which the skull alone was in an imperfect 

 fragmentary condition, and the teeth, unfortunately, entirely 

 w^anting. This animal was as large as a jaguar, and exhibits 

 short, powerftd, highly flexed limbs, widely spreading clawed 

 feet, heavy backbone, very deep sagittal crest and small 

 brain case. It is a typical Middle Eocene Creodont, with 

 highly specialized cutting teeth. 



WoRTMAN, The Osteology oi Patriofelis, Bull. Am. Mus. Nat. Hist., VI, 



1894, pp. 129-164, pi. i. 

 OsBORN, OxycB-na and Patriofelis Re-studied as Terrestrial Creodonts. 



Bull. Am. Mus. Nat. Hist., XIII, 1900, pp. 269-279, pll. xviii, xix. 



5. Protorohippus venticolus {Cope), 



Am. Mus. No. 483»- 



This is the famous skeleton described by Cope in ' The 

 Tertiary Vertebrata,' as the four-toed Lower Eocene Horse. 



