32i 0. C. Marsh — Notice of New JFossil Mammals. 



Figs. 1 and 2. 



Figure 1. — Part of skull, with horn-cores, of Bison aUicomis, Marsh : 

 Figure 2. — The same specimen ; seen from the left. 

 Both figures are one-eighth natural size. 



front view. 



The remains of this species are found in the sandstones of 

 the Denver group, at the eastern base of the Rocky Moun- 

 tains, where they indicate a well-marked horizon, which may 

 be called the Bison beds. These deposits are more recent than 

 the Equus beds, and are probably late Pliocene. 



The locality of the type specimen is on the banks of Green 

 Mountain Creek, near Denver, Colorado, where it was found 

 by George L. Cannon, Jr., of Denver. Portions of the same 

 specimen were subsequently secured by Whitman Cross of the 

 IJ. S. Geological Survey. Other remains were obtained by 

 G. H. Eldridge of the Survey, and all were sent to the writer 

 for examination. 



