THE MAMMALIA. 



forms leave us very far from a proper knowledge 

 of the primary Hoofed animal. And the connection 

 between Coryphodon and the colossal Dinocerata 



Fro. 14. Coryphodon. Skull with Brain. One-fifth nat. size. 

 After Marsh. 



(which are confined to the west of the Eocky 

 Mountains) also appears very indefinite. "We shall 

 again have to return to the Dinocerata. 



