U. S. GEOLOGICAL SDRVET 



MONOGRAPH 55 PLATE CXL 



SKULL OF MENODUS GIGANTEUS 



One-fourth natural size. (See pp. 523, 532, also PI. CXXXIX.) Field Mus. P 5927, male, Phinney Springs, S. Dak., Chadron 

 formation, uppermost level. The front vie-wr sho^vs the great length and tapering character of the horns, the fundtionally 

 edentulous incisive borders, the great v^idth of the nasals, and the moderate expansion of the zygomata 



