PLATE CLXXVI 



Type Skull of Brontotherium medium 



Plate prepared under the direction of Professor Marsli. One-fourth natural size. (See p. 573) 



Skull w, type (Nat. Mus. 4256), Big Badlands, S. Dak. (?Indian Draw), Chadron formation, level upper C. Ai, Front view; 

 A2, palatal view. The specific name medium was given in allusion to the intermediate length of the nasals, which are shorter 

 than in the tj-pe of elatus but longer than in type of curium. (See Pis. CLXXV and CLXXVII.) The horns are of the 

 same general form as those of B. curium and B. platyceras, though not quite so fiat. The generic characters noted above 

 (Pis. CXXXIII and CLXIII) are well shown in the dentition. 



