182 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



length of the horn on the outer curve. In hke manner we may 

 obtain the index of the curvature of the horn-core. As determined 

 by Tscherski, this is 119.4; in No. 1584, U.S.N.M., the index is about 

 125; in No. 5726 it is 125, as has already been stated. 



If the width of the forehead is regarded as 100 the length of the 

 forehead from the occipital crest to the rear of the nasals will be in 

 Tschei-ski's Jana skull 83.9, wliile in No. 5726 of the United States 

 National Museum it will be 79. 



BISON ALLENI Marsh. 



The type of this species is a horn-core which was found in the Blue 

 River near Manhattan, Kansas, and which is preserved in the col- 

 lection of Yale University. The writer has studied the original 

 specimen and has taken measurements from it. He has also made 

 use of a cast of the specimen now in the United States National 

 Museum in making comparisons with other specimens. The measure- 

 ments of the original are given in the second column of the following 

 table. The writer's own measurements differed but little from 

 those made by Lucas. There is a partial skull of the same species 

 in the collection of Stanford University, California; and this has 

 been figured by Lucas in the paper already cited (pis. 79 and 80). 

 Lucas's measurements appear below in the third column. 



In his paper already referred to, Gilmore published (pi. 11) a 

 figure of a pah of horns joined by the rear of the skull. This is No. 

 2383, United States National Museum, and was discovered on Little 

 Minook Creek, a few miles southeast of Rampart, Alaska. It was 

 afterwards used to adorn the roof of a miner's cabm, and thus attracted 

 the attention of Gen. Timothy E. Wilcox, of the LTnited State Army, 

 who secured it for the United States National Museum. This speci- 

 men is of especial value because of the presence of the sheaths of the 

 horns. These are somewhat decayed away at the base and somewhat 

 weathered and splintered elsewhere; but the specimen is extremely 

 valuable, and adds greatly to our knowledge of the species. The 

 measurements appear hi the fourth column. GUmore's illustration 

 is reproduced for comparison with other specimens (pi. 15, fig. 3). 

 In the first column are given the measurements of another skull which 

 will be here especially considered. No. 7706, United States National 

 Museum. 



