380 EXTINCT MAMMALIA OF NORTH AMERICA. 



Oreodon major. 



See page 99, PI. VII, Fig. 1 ; VIII, 

 Leidy: Anc. Fauna Neb. 1853, 55, PI. IV, Fig. 6 ; Proc. Ac. Nat. Sc. 1853, 398; 1866, 164; 

 1857, 89. 

 Mauvaises Terres of White River, Dakota. Miocene. 



Oreodon afftnis. 



See page 105, Pi. IX, Fig. 3. 



Oreodon hybridus. 



See page 105, PI. IX, Fig. 4. 



Oreodon bnllatus. 



See page 106. 



MERYCOCHCERUS. 



Merycochoeras proprins. 



See page 110, PI. X. 

 Leidy : Proc. Ac. Nat. Sc. 1858, 24. 

 From a calcareous grit on the head- waters of the Niobrara, opposite Fort Laramie. 

 Miocene. 



MERYCHYUS. 



Meryohyns elegans. 



See page 118, PL XI, Figs. 1—11. 



Leidy : Proc. Ac. Nat. Sc. 1858, 24. 

 Sands of the Niobrara River, Nebraska. Pliocene. 



Merychyus medins. 



See page 119, PI. XI, Figa. 12—14. 



Leidy : Proc. Ac. Nat. Sc. 1858, 25. 

 Sands of the Niobrara River, Nebraska. Pliocene. 



Meryohyns major. 



See page 121, PI. XI, Figs. 15, 16. 



Leidy : Proc. Ac. Nat. Sc. 1858, 26. 

 Sands of the Niobrara River, Nebraska. Pliocene. 



LEPTAUCHENIA. 



Ijeptanclienia major. 



See page 124, PI. XII, Figs. 1—5. 

 Leidy : Proc. Ac. Nat. Sc. 1856, 163 ; 1857, 89. 



From a tributary of White River, in the Mauvaises Terres, near Eagle Nest Butte, 

 and from White Earth Creek, another tributary of White River. Miocene. 



