170 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 46. 



found a flint arrowhead. This fact has been treated by WHliston 

 and McClung. 



Besides the measurements of the skull (figs. 4 and 5) presented on 

 page 168, in the fifth column, it may be added that the width at the 

 rough eminence above the fourth premolar is 168 mm.; the lower jaw 

 has a height of 72 mm. at the hinder molar. 



The teeth are worn down well toward the roots. The upper tooth 

 line, not including the missing pm.^, is 144 mm. long. The following 

 are the dimensions of the teeth so far as obtainable: 



Fig. 4.— Bison occidentalis. Skull at Kansas Univeksity. Frontal view. 

 Measurements of teeth. 



The width of m.^ was taken across the hinder lobe, the front lobe 

 being mjured; the widths of pm.g and of pm.g were taken at the rear. 

 M.g measured across the middle lobe 29 mm.; across the hinder lobe, 

 11 mm. Inasmuch as the length of each tooth diminishes as it is 

 worn toward the base, the lengths were doubtless greater earlier in 

 life. For the dimensions of the upper teeth in skulls of Bison bison 



