PLATE CII 



Lower Jaw of Bkontops robustus 



Plate prepared under the direction of Professor Marsh. One-fourth natural size. (See p. 496) 



Yale Mus. 12048, type, Dry Creek, 5 miles northeast of Chadron, Nebr. (J. B. Hatcher), Chadron formation, probably upper levels. 

 Ai, Top view; Ao, side view. The very shallow symphyseal region of this jaw by convergent evolution resembles that of 

 Brontotherium. 



