Peterson: Miocene Beds of Nebraska and Wyomin< 



25 



The principal differences between Mesoreodon chelonyx, the best 

 known species described by Professor Scott, 5 and Mesoreodon megalodon 



Fig. 2. Side view of upper and lower jaws of Mesoreodon megalodon. \ nat. 

 size. Type. No. 1325. 



Fig. 3. External view of left mandible of Mesoreodon megalodon. \ nat. size. 

 Paratype, No. 1 323. 



may be stated by saying that in the present specimens the teeth are 

 relatively heavier, the molars having a slightly greater anteroposterior 

 diameter, the dentition being more crowded ; the occiput probably 



*Am. Nat, Vol. XXVII., p. 661 (1893) ; Trans. Amer. Philos. Society, Vol. 

 XXVIII., pp. 125-145(1894). 



