V. S. GEOLOGICAL SURVEY 



MONOGRAPH 55 PLATE CLII 



FEMALE SKULL OF MEGACEROPS ACER? 



One-third natural size. (See p. S4S, also Pis. CXLVI, CXLVTI, and CLI.) Referred female skuU (Am. Mus. 6350; type of 

 Symborodon altiro^ris Ckspe), Horsetail Creek, northeai4ern Colorado, Chadron formation. The dentition reveals the 

 generic charadters mentioned in the explanation of Plate CXLV. Very clear evidences of close relationship with the 

 skuU figured in Plate CXLV, A 



