2 6 Department of Vertebrate Palaontology. 



It was found by Dr. J, L. Wortman in the Wind River Beds of 

 Wyoming (Middle Eocene). Since its purchase by the Ameri- 

 can Museum the entire skeleton has been taken apart and re- 

 mounted as a walking animal; in the original mounting the 

 animal was represented as pacing. The skeleton is far from 

 perfect, the limbs upon the left side being largely restored, 

 while those upon the right side are complete. The ribs are 

 entirely restored, as is the pelvis. In the remounting of the 

 skeleton these missing parts were studied from the correspond- 

 ing bones in the well-known form Mesohippus. 



Cope, Tertiary Vertebrata, pp. 635-647, pi. xlix a, h and c. 

 Wortman, Species of Hyracotheriiim and allied Perissodactyls from the 



Wahsatch and Wind River Beds of North America, Bull. Am. Mus. 



Nat. Hist., VIII, 1896, pp. 81-110. 



6. Hoplophoneus primaevus Leidy. 



Am. Mus. No. 1406. 



The skeleton was procured by the American Museum Expe- 

 dition of 1894 in the Oreodon Beds of South Dakota, and is one 

 of the most complete fossil skeletons ever found. The only 

 parts missing were some of the processes and spines of a 

 few vertebrae. This animal is characterized by powerful 

 canines protected by a heavy flange upon the lower jaw, and 

 is considered the ancestor of the great Sabre-tooth Tiger 

 Smilodon. 



RiGGS, Restoration of Hoplophoneus occidentalis Leidy, Kan. Univ. 

 Quar., V, 1896, pp. 37-52, pi. i. 



7. Palaeosyops major Leidy. 



Am. Mus. No. 1544. 



PalcBosyops was one of the first fossils found in the Eocene 

 deposits of the Western States. Materials for this mounted 

 skeleton were secured with great difficulty by the American 

 Museum Expeditions of 1893 and 1895 in the Brfdger and 

 Washakie Beds of Wyoming. The skull, fore limbs and foot, 

 and a large part of the vertebral column and ribs belong to a 

 single skeleton, and the parts associated with these were put 



