194 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



At my request, Prof. N. M. Fenneman, of the University of Cin- 

 cinnati, has measured the longer horn-core and has found the length 

 along the upper curve to be 828 mm.; along the lower curve, 880 

 mm. Apparently a shght damage at the base on the underside makes 

 the starting point doubtful. Eight hundred and eighty milhmeters 

 maybe regarded as correct. The wTiter finds that the distance from 

 the upper part of the base of the horn-core to the tip, in a straight 

 hne, is 805 mm. This, divided into the length along the lower curve 

 and multipHed by 100, gives as the index of curvature about 110. 

 These measurements are to be compared with those of the skull 

 here described as Bison regius. 



Measurements of skull of type of Bison regius. 



Length of the skull from lower border of the foramen magnum to front of pre- 



maxillse 580 



Length of the skull from middle of occipital crest to front of premaxillse 640 



Length from middle of occipital crest to fronto-nasal suture 320 ± 



Distance from middle of occipital crest to line joining rear of orbits 315 



Distance from front of premaxillsB to line joining rear of orbits 425 



Distance between bases of horn-cores 362 



Width across rear of skull at ear openings 305 



Height of occipital crest above lower lip of foramen magnum 165 



Distance between hinder ends of temporal fossse 200 



Width of skull at rear of orbits 360 



Width of skull at front of orbits 265 



Width at constriction between horn-cores and orbits 342 



Width in front of orbits on maxillo-malar suture 212 



Width at middle of maxillo-premaxillary suture 125 



Greatest distance, in a straight line, across nasals, as shown by space occupied 



by them 83 



Diameter of orbit, fore-and-aft 72 



Width across occipital condyles 140 



Width of foramen magnum 50 



Distance between the anterior premolars 110± 



Distance between the hinder molars 135± 



Length of horn-core on upper curve 910 



Length of horn-core on lower curve 1. 015 



Diameter of base of horn-core, fore-and-aft 160 



Diameter of base of horn-core, vertical 147 



Circumference of base of horn-core 478 



Distance between tips of horn-cores 1-725 



When a ruler is laid along the hard palate and extended to the 

 occipital condyles, it is found that the latter are about 58 mm. above 

 the level of the palate. In this respect the specimen agrees with 

 two skulls of the American bison at hand. In the specimen of B. 

 aUeni above described, from Hunter Creek, Alaska, the condyles fall 

 sUghtly below the line of the palate. 



