PLATE XCVI 



Type Skull and Jaw of Beontops robustus 



Plate prepared under the direction of Professor Marsh. One-third natural size. (See p. 494) 



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

 This great skuU represents the culminating member of the Broniops phylum. It is highly specialized in its massiveness and great 

 breadth, in the position of the horns, which are far in front of the orbits, in the great development of the external basal ridge 

 of the horns, in their flattened basal section, and in the thickness and abbreviation of the nasals. Relationship with Brontops 

 dispar is indicated by the shortness of skull top and base, by the absence of the mid-parietal eminence, and by the form of the 

 premolars. Convergent resemblances to Brontotherium are seen in the flatness of the horns, abbreviation of nasals, swollen 

 zygomata, short, robust canines, and heavy round-topped incisors. 



