PLEISTOCENE OF EUROPE, NORTH AFRICA, AND NORTH AMERICA 483 



B. bison, and is readily distinguished by the position of the horns, which 

 are placed almost at right angles to the long axis of the skull. The horns 

 of another species {B. ferox), resembling those of B. latifrons, have l^een 

 fomid in the Pleistocene of Nebraska. The Pleistocene of Idaho and Kansas 

 has yielded the horn cores of a fifth species (B. alleni). The giant north- 

 western bison found in Alaska, which may have existed also in eastern Siberia, 

 is B. crassicornis. There also lived in Alaska, probably in late Pleistocene 

 times, and ranged down into Kansas, the species B. occidentalis. This animal 

 most closely resembled the living Ijison, with which it was probably contem- 

 poraneous for a time. A complete specimen of a bull of this species was 



Fig. 213. — • Skek'ton of the extinct bison B. occidentalis. In the University of Kansas. 



After McClung. 



discovered with seven or eight other skeletons near Russell Springs, Logan 

 County, Kansas, in association with a flint arrowhead.^ The skeleton as 

 mounted in the Kansas Museum (Fig. 213) is considerably larger than 

 that of the largest recent bison in length and height, and in the length of 

 the hind limbs. The horn cores are similar in shape and proportions. 



Mountain antelopes. — A late arrival in the western mountain region 

 only is the so-called 'Rocky Mountain Goat' (Oreamnos). This animal 

 is the sole representative in North America of the very aberrant group of 

 mountain antelopes known as the chamois sub-family, or Rupicxxprince, a 

 subdivision of the Bovidae, comprising five widely scattered animals, which 

 are distributed on mountain heights from the Pyrenees of Spain to the 



1 McClung, Restoration of the Skeleton of Bison occidentalis. Kansas Univ. Sci. Bull., 

 Vol. IV, no. 10, Sept., 190S, pp. 249-2o-l. 



