321 



111 ]\Iicrosyops, six molar teeth imineiliatcly succeed the canine in tlie lower 

 jaw. In the typical Limnotherium clegans seven molars occupy the same 

 position. Described page 82, and represented by Figs. 14, 17, Plate VI. 

 From the Bridger Eocene formation of Wyoming. 



MICROS US. 



MiCKOSUS CUSPIDATUS. ■ 



Leitly : Pr. Ac. Nat. Sc. 1870, 113. 



Sec page 81 ; not positively determined as a distinct species and genus. 

 Represented by Figs. 10, 11, Plate VI. From the Bridger Eocene 

 formation of Wyoming. 



HIPPOSYUS. 



HlPPOSYUS FORMOSUS. 



Leidy : Pr. Ac. Nat. Sc. 1872, 37. 



Described from a few isolated teeth, page 90, and represented in Fig. 41, 

 Plate VI, and Figs. 1, 2, Plate XXVII. From the Bridger Eocene of 

 Wyoming. 



HlPPOSYUS EOBUSTIOE. 



Notharctiis rohustior, Leidy : Hayden's Eep. Geol. Sur. Montana 1872, 304. 



Described page 93, and represented by Fig. 40, Plate VI. Fnnii the 

 Bridger Eocene of Wyoming. 



HADROHYUS. 



HADROnVtlS SUPREMUS. 



Leidy : Pr. Ac. Nat. Sc. 1871, 248. 



Indicated by a mutilated tooth from the Miocene of Oregon. Described 

 pa'ge 222, and represented by Fig. 26, Plate XVII. 



PERISSODACTYLA, 



Sulidungula. 



Equid^e. 



EQUUS. 

 Equus major. 



Dekay: Nat. Hist. New York, Zool. 1842, 108. Leidy: Ext. Mam. N, America 



1869, .399. 

 Eqmis complicatus. Leidy : Pr. Ac. Nat. Sc. 1858, 11 ; Ext. iMaiii. N. America 

 1809, 399. 



41 G 



