APPENDIX 



Article XXX Y. — Notice of New Fossil Mammals; by 



O. C. Marsh. 



Among the large number of extinct mammals recently 

 received at the Yale Museum from the West, are several of 

 especial interest, as they serve to mark definite horizons in the 

 Tertiary deposits east of the Rocky Mountains, or show im- 

 portant characters not before observed. A notice of some of 

 these species new to science is given below, and more complete 

 descriptions will appear elsewhere. 



Bison alticomis, sp. nov. 



This species of Bison is represented by various remains, the 

 most important of which is the portion of a skull, figured 

 below. This specimen, which may be regarded as the type, 

 indicates one of the largest of American bovines, and one 

 differing widely from those already described. The horn-cores, 

 instead of being short and transverse, as in the existing bisons, 

 are long and elevated, with slender, pointed ends. They have 

 large cavities in the base, but in the upper two-thirds are nearly, 

 or quite, solid. Their position is well shown in the cuts below, 

 figures 1 and 2. The frontal region between the horn-cores is 

 broad, somewhat convex, and very rugose. 



