EXTINCT MAMMALIA OF NORTH AMERICA. 389 



PERCHCERUS. 



Perchoerus probns. 



8ee page 194, PL XXI, Figs. 20—27. 

 Palmocharus prohm, Leidy : Proc. Ac. Nat. Sc. 1856, 16.5; 1857, 89. 



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



LEPTOCHCERUS. 



Leptoohoems speotabilis. 



See page 197, PI. XXI, Figs. 14—19. 



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

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



NANOHYUS. 



Nanohyns 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 THERID^. 



HYOPOTAxMUS. 



Hyopotaiuus americanns. 



See page 202, PI. XXI, Figs. 1—6. 



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



Charopotamus (Byopotamus) americanus, Leidy : Proc. Ac. Nat. Sc. 1857, 89. 



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

 Titanotherium in the lowest bed of the tertiary formation. 



TITANOTHERIUM. 



Titanotherium Prouti. 



See page 206, PI. XXIV. 

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



dePaleont. 1853, L 311. 

 Palwotherium ? Proutii, Owen, Norv^'ood and Evans: Proc. Ac. Nat. Sc. 1850, 66. Leidy: Ibid. 



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

 Pakeotherium {^Titanotherium) Proutii, 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. 

 Pahrotherium maximum, Leidy: Owen's Rep. etc. Ref. to Tab. XII B, Figs. 3, 4. 

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



1853, 392; 1854, 35, 157 ; 18.56, 92; 1857, 89. Broun : Letli. Geog. 1856, III, 864. 



