South Dakota School of Mines 



Bulletin Xo. 13. Plate Xo. 31. 



A. Skeleton of Hyracodon nehrascensis. Restoration in Museum of 

 Princeton University. Sinclair. Head of same shown enlarged in 

 Plate 14 A. 



X 



-*•>■ 



R fill >4 



%,±. 



i 



B. M or opus cooJci, as restored by Barbour, 1909. 



