TJ. S. GEOLOGICAL SURVEY 



MONOGRAPH 55 PLATE XC 



SKULL OF BRONTOPS DISPAR 



Lte prepared under the diredlion of Professor Marsh. One-sixth natural si:;e. (See p. 489.) Nat. Mus. 

 4245 (erroneously lettered skull P, according to J. B. Hatcher), locality uncertain, Chadron formation. 

 Ai, Top view; A-, palatal view; A3, side view. This skull exhibits a certain resemblance to Allops 

 marshi, but the measurements are closer to those of B. dispar. The original is badly crushed and as here 

 reconstructed the tooth rows may perhaps be too redtilinear 



