U, S. GEOLOGICAL SURVEY 



MONOGRAPH 55 PLATE CTX 



TYPE SKULL OF DIPLOCLONUS AMPLUS 



Plate prepared under the dire(5tion of Professor Marsh. One-fourth natural si^e. (See p. 504.) Yale Mus. 12015a, type. South Dakota, Chadron forma- 

 tion. The lateral view (AO exhibits well the concave skull top, ^out sygomata, thick, pointed horns, and short nasals. The form of the canine 

 recalls that of Allops and of Menodus; the upper premolars have external cingula. In front view (A 2) the pointed horns, pronounced hornlets, 

 and Tvide zygomata are especially noteworthy. (Compare PI. CVII) 



101959--29— VOL 2 20 



