Am. Jour. Sci., Vol. XLIII, 1892. 



Plate X. 



6*3 



2. 



Cx3 



dx3 



a 6x3 



6x3 



(7x3 



a 6x3 



5. 



Cx3 



dx3 



6x2 



dx2 



American Cretaceous Mammals. 



