EXTINCT MAMMALIA OF NORTH AMERICA. 389 



PERCHCERUS. 



PerchcBrus probus. 



See page 194, PI. XXI, Figs. 20—27. 

 FalcBochcerus probm, Leidy : Proc. Ac. Nat. Sc. 1856, 16-5 ; 1857, 89. 



From the Mauvaises Terres of White River, Dakota. Miocene. 



LEPTOCHCERUS. 



Leptochcerus speotabilis. 



See page 197, PI. XXI, Figs. 14—19. 



Leidy : Proc. Ac. Nat. Sc. 1856, 88 ; 1857 ,89. 

 From the Mauvaises Terres of White River, Dakota. Miocene. 



NANOHYUS. 



Nanohyus porcinus. 



See page 200, PI. XXIX, Figs. 11, 12. 

 Leidy : Proc. Ac. Nat. Sc. 1869., 65. 



From the Mauvaises Terres of White River, Dakota. Miocene. 



ANTHRA GO THERIDJE. 



HYOPOTAMUS. 



Hyopotamus americanns. 



See page 202, PI. XXI, Figs. 1—6. 

 Leidy : Proc. Ac. Nat, Sc. 1856, 59. 

 Chceropotamus (^Hyopotamus) americanus, Leidy : Proc. Ac. Nat. Sc. 1857, 89. 



From the Mauvaises Terres of White River, Dakota. Found in association with 

 Titanotherium in the lowest bed of the tertiary formation. 



TITANOTHERIUM. 



Titanotlieriuin Pronti. 



See page 206, PL XXIV. 

 Fakeotherium, Prout: Am. .Jour. Sc. 1846, II, 288, Fig. 1 ; 1847, III, 248, figures. Pictet : Traite 



de Paleont. 1853, I, 311. 

 PalcBotherium ? Froutii, Owen, 'Norwood and Evans: Proc. Ac. Nat. Sc. 1850, G6. Leidy; Ibid. 



122; Ibid. 1851, 170; Owen's Rep. Geol. Surv. Wise. &c. 1852, .551. 

 FalcBotherium {Titanotherium) Proidii, Leidy: Owen's Rep. Geol. Surv. Wise. 1852, Tab. IX, 



Figs. 2, 3 ; XII B, Figs. 3, 4, 6, 7, 8. 

 Rhinoceros f Americanus, Leidy : Proc. Ac. Nat. Sc. 1852, 2. 

 Fakvotherium maximum, Leidy : Owen's Rep. etc. Ret", to Tab. XII B, Figs. 3, 4. 

 Titanotherium Froutii, Leidy : Anc. Fauna Neb. 1853, 72, Pi. XVI, XVII ; Proc. Acad. Nat. Sc. 



1853, 392 ; 1854, 35, 157 ; 1856, 92 ; 1857, 89. Broiui : Leth. Gcog. 1856, III, 8G4. 



