PLATE CXLIII 



Type Skull of Megacerops copei 

 Plate prepared under the direction of Professor Marsh. One-fourth natural size. (See pp. 543, 548, also PI. CXLIV) 



Skull V, type (Nat. Mas. 4711), Big Badlands, Indian Draw, S. Dak., Chadron formation, level upper C (Hatcher). Ai, Side 



view; A2, palate. 

 The vertical position of the horns in this figure is largely due to crushing. A more accurate representation of the teeth is given in 



Plate CXLV. 

 This skuU was referred by Marsh to Menodus { = Diconodon) monlanus but differs generically from the type in the nasals, premolars, 



and molars. 

 Characteristic Megacerops features observed in this skuU are the extremely short face, upturned premolar series, small and closely 



approximated canines, horns of subcylindrical basal section without connecting crest. Affinity with Brontotherium is seen in 



the general contour of the skull, midparietal convexity, expanded zygomata, decurved nasals, advanced submolariform 



premolars, and short, bulbous canines. 



