PLATE CXXIV 



Skulls of Menodus heloceras and Brontotherium hatcheri 



Plate prepared under the direction of Professor Cope. One-fourth natural size. (See p. 524, also PL CXXIII) 



A>, A', A3, Type skull of Menodus heloceras (Am. Mus. 6360), Horsetail Creek, northeastern Colorado, Chadron formation. 

 B, Brontotherium hatcheri (Am. Mus. 6353), Colorado, Chadron formation. This palate was originallj' referred by Cope to "Sym- 

 borodon acer," but because of the presence of incisors it is referred to Brontotherium bj' the author. 



