44 Bulletin American Museum of Natural History. [Vol. XXXIV, 
VRE MY 
WY 
Fig. 39. Vassacyon promicrodon, hind limb bones, front views, natural size. 
ton, No. 15161, Lower Gray Bull beds, Big Horn Basin. 
From skele- 
Fig. 40. Vassacyon, caleaneum and astragalus, superior views, natural size. No. 
15258, Gray Bull beds, Big Horn Basin. 
