V. S. GEOLOGICAL SURVEY 



MONOGRAPH 55 PLATE LXXXII 



COMPARISON OF UPPER TEETH OF RHADINORHINUS, DIPLACODON. MENODUS, AND BRONTOTHERIUM 

 Drawings by E. S. ChriStman. A is natural size; in B, C, and D the premolar-molar scries is reduced to tKe same length as in A. (See pp. 434, 

 474.) A, Rhadinorhinus diploconus, type (Am. Mus. 1863), White River, Utah, level Uinta B 1 or 2. B, Diplacodon elatus, type (Yale Mus. 

 10320), level Uinta C(?). C, Menodus cf. M. proutii (Carnegie Mus. SS8), Chadron formation. D, Brontotherium gigas elatus (Am. Mus. 

 492), Cheyenne River, S. Dak., Chadron formation 



