180 PROCEEDINGS OF THE NATIONAL MUSEUM. vod. 46. 



not much above the level of the forehead. If, after the manner of 

 Tscherski, we make the distance from the base of the hom-core 

 to its tip equal to 100, the length along tlie lower curve will be found 

 equal to 125, in both No. .5726 and No. 1584, U.S.N.M. This mdex is 

 to be compared ynth that of the other species; but the actual length 

 of the hom-core is likewise to be taken into consideration. 



The specunen of B. crassicornis which was figured by Lucas 

 (pi. 74), No. 1584, United States National Museum, was found, 

 according to the record, by J. Henry Turner somewhere on either 

 the Yukon River or the Kotlo River (Birch Creek), Alaska. It 

 presents only the left side of the rear of the skull and the left horn- 

 core, the tip of the latter being broken off. In the second column, 

 on page 179, is found such measurements as can be obtained. Those 

 with the sign ± are estimated, but are not far from the correct 

 figures. The diameters of the horns are not those given by Lucas, 

 as that writer has apparently erred, an unusual thing in his case. 

 The horn-cores of this specimen are flattened on the upper face 

 much more than m the other specimens. 



No. 5727 of the United States National Museum was found on 

 Little Minook Creek, about 6 miles southeast from Rampart, Alaska. 

 It was presented by Messrs. Bowen and Coole, miners on claim 21, 

 through C. W. Gilmore. It wa^ found at a depth of 21 feet from the 

 surface, lying m the gravel, which itself lies on the bedrock. The 

 gravel is overlain by what is there called muck. This, hke the other 

 specimens hitherto secured, presents only the rear of the skull, 

 not reaching the orbits, together with the horn-cores. These last, 

 however, lack a few inches at the tip. The measurements appear 

 in the third column on page 179. 



In the Field Museum of Natural History there is a pair of fine 

 horn-cores joined to the rear of the skull (pi. 14, figs. 3, 4). The 

 forehead extends anteriorly to the fronto-nasal suture. The speci- 

 men has the number 6834 and is labeled as having been secured at 

 Point Barrow, Alaska. It is one of three bison skulls which were 

 formerly m the University of Pennsylvania. The writer was kindly 

 permitted to take notes and photographs of the specimen. The 

 measurements appear in the fourth column on page 179. It will be 

 observed that in most of the measurements this skull is the largest 

 on the list. In the case of the distance between the hinder ends of 

 the temporal fossae this is short. This dimension seems, however, 

 to be extremely variable. It will be noted that the horn-cores are 

 more flattened at their base than any other specimen measured, 

 although but little more than in No. 1584 of the United States 

 National Museum. 



Figure 5 of plate 14 represents a view of a partial skull which is in 

 the Memorial Museum, at Golden Gate Park, San Francisco. It was 



