PLATE VI J. 



h'lQ. 2. 



Fig. 4. 



kai' f i pi 



Fig. 6. 



j^ ai aV pi 



ae 



Fig. 7. 



Fig. 8. 



ae y 



pec-... 



flfe 



ace 



--•ai 



Fig. 9. 



Fig. 10. 



Fifr. 1, Mioclnenus corrugatm, superior molars. Fijr. 2, Pantolamhda hntJimndon^ 

 superior true molars. Fig. 3, Phenacodus prirrnxvus, superior molar. Fig. 4, do. interior 

 molar. Fig. ."), Lamhdotherium popoa(ficitm, superior molar. Fig. 6, do. inferior molar. 

 Fig. 7, Anchitherinm aurelianenne, superior molar. Fig. 8, Hippotheriitm gradle^ infe- 

 rior molar. Fig. 9, superior molar young crown of a Hippotherium. Fig. 10, superior 

 molar of Equus. Figs. 1, 2, 5, 6, n-om Cope ; 3, 4, from Wortman ; the others from 

 Gaudry. 



