EXTINCT BISONS OF NORTH AMERICA— HAY. 



173 



280 mm. The following additional measurements are given, and for 

 comparison the corresponding ones of a mounted American bison in 

 the U. S. National Museum, No. 12456. 



Measurements of the scapula, pelvis, and limb bones. 



Dimensions taken. 



Biion occi- 

 dentalis. 



Scapiila: 



Length 



Width of upper end 



Humerus: 



Total length 



Length from head to distal end, inner side 



Fore-and-aft diameter of middle of shaft 



Width of articular surface at lower end 



Ulna, total length, in a straight line 



Radius: 



Total length 



Transverse diameter of middle of shaft 



Transverse diameter of lower end 



Anterior cannon bone: 



Length 



Transverse diameter at lower end 



Pelvis: 



From anterior end to middle of acetabulum 



From middle of acetabulum to rear of ischium 



Distance from lower border of one acetabulum to that of the other 



Femur: 



Total length 



Length from head to lower border of iimer condyle 



Transverse diameter at middle of shaft 



Distance from inner surface of head to outer surface of greater trochanter . . 

 Tibia: 



Total length 



Width of lower end 



Calcaneum, total length 



Hinder cannon bone: 



Total length 



Transverse diameter at middle of length 



mm. 

 575 

 300 



65 

 107 

 470 



345 

 58 

 102 



330± 

 282± 

 220 



523 



487 



440 

 400 

 53 

 160 



412 

 82 



It will be seen that, as compared with the mounted American 

 bison, the Kansas specimen has all the limb bones longer, but not 

 greatly longer. The length of the hind leg from the femur down, in 

 the Kansas specimen, is 930 mm. ; in the mounted American bison, 

 860 mm. Most of the measurements of the skull indicate a somewhat 

 larger animal than the specimen in the American Museum of Natural 

 History, No. 13731. The horn-cores are, however, considerably 

 shorter than in the latter specimen. One of the most remarkable 

 features of this specimen is the narrowness of that part of the face in 

 front of the orbits. In this respect it is wholly different from the 

 American Museum specimen and from one figured by Quackenbush ^ 

 here reproduced (pi. 10, fig. 3, c), and from all other known specimens 

 from Alaska or elsewhere. One might readily suppose that such a 

 difference would indicate a distinct species. However, in Lydek- 

 ker's Wild Oxen, vSheep, and Goats, there is a view of the skull of a 

 bull and one of a cow of the European bison; and in the bull the face 

 is narrowed as it is in the Kansas specimen. For the present, there- 

 fore, it seems best not to remove this specimen from B. ocddenfalis. 



BuU. Amer. Mus. Nat. Hist., vol. 26, pi. 17. 



