128 



University of California Publications in Geology 



[Vol. 9 



Reference to figures la, 2a, 2b, 3a, 3b, 4a, and 46 make it evident 

 that the variation in the horn-cores of B. antiquus as regards their 

 curvature, general form, and relations to the skull are very slight. 

 Comparison of figures of the old male from the John Day region (figs. 



Figs. 3a and 3b. Bison antiquus Leidy, ^. Cranium and left horn-core. 

 No. 21154, X V», Kancho La Brea beds. Fig. 3a, dorsal view; fig. 36, posterior 

 view. 



Figs. 4a and 46. Bison antiquus Leidy, Cranium and horn-cores. No. 

 21153, X Vs, Kancho La Brea beds. Fig. 4a, dorsal view; fig. 46, posterior view. 



