PLATE CLVII 



Skulls of Menodus, Brontotheeium, and Megacerops and a Fragment of a Humerus 



Plate prepared under the direction of Professor Cope. One-third natural size. (See pp. 529, 546, also Pis. CXXVIII, CXXIX, 



and CLXXXIII) 



A, Menodus trigonoceras, type (Am. Mus. 6355), Horsetail Creek, northeastern Colorado, Chadron formation. Front view. Tliis 



species was referred by Cope to "Symborodon." 



B, Occiput referred to Brontotherium curtum? (Am. Mus. 6346), Horsetail Creek, northeastern Colorado, Chadron formation. 



This specimen was one of the cotypes of Cope's Symborodon bucco (see p. 212) but probably pertains to a large Brontotherium. 



C, Female skull referred to Megacerops acerf (Am. Mus. 6349), Colorado, Chadron formation. Occipital view of a small skull 



regarded b}' Osborn as a female of M. acer. 

 Di, D2, Front and distal views of an undetermined humerus from the Chadron formation, Colorado. 



