566 



TITANOTHERES OF ANCIENT WYOMING, DAKOTA, AND NEBRASKA 



Figure 468. — Lower jaws of Brontotherium hatcheri and B. gigas 



A, Brontotherium hatcheri, Univ. Wyoming Mus. 1 (reversed); B, B. hatcheri. Am. Mus. 1070; C, B. gigas, Yale Mus. 12009 (type). One- 

 fiftb natural size. In these jaws the chin is shallow, almost concave, as in typical brontotheres, the ramus stout and massive, the 

 canines spoon-shaped, the incisors well developed, the external cingula wanting, no diastema in front of pi (if that tooth is present) . 



