U. S. GEOLOGICAL SURVEY 



MONOGRAPH 65 PLATE CXLI 



SKULL OF MENODUS GIGANTEUS 



One-fourth natural size. (See p. 532.) Am. Mus. 505, male. Big Badlands, S. Dak., probably Cheyenne River, Chadron 

 formation. This skull exhibits the dental and cranial charadlers of Menodus giganteus as described above. (See 

 Pis. CXXXIII, GXXXVII, CXXXVm, and CXXXIX.) The horns show well the pointed tips and flattened external 

 base. The basicranial region sho-ws the alisphenoid canal, the foramen ovale, the paired and median protuberances 

 for the redli capitis antici muscles, the periotic bone, the proximal end of the stylohyoid, and the condylar fo 



