321 



In Microsyops, six molar teeth immediately succeed the canine in the lower 

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

 position. Described page 82, and represented by Figs. 14, 17, Plate \*L 

 From the Bridger Eocene formation of Wyoming. 



MICROSUS. 



MlCEOSUS CUSPIDATUS. 



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



See 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 FOEMOSUS. 



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. 



Notharctus rohustior. Leidy : Hayden's Eep. Geol. Sur. Montana 1S72, 304. 



Described page 93, and represented by Fig. 40, Plato VI. From the 

 Bridger Eocene of Wyoming. 



HADROHYUS. 



Hadrohyus supeemus. 



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



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

 page 222, and represented by Fig. 26, Plate XVII. 



PERISSODACTYLA, 



Sulidungula. 

 Equips. 



EQUUS. 



Equus majoe. 



Dekay : Nat. Hist. New York, Zool. 1S42, 108. Leidy : Ext. Maui. N. America 



1869, 399. 

 Eqims complicatus. Leidy : Pr. Ac. Nat. Sc. 1858, 11 ; Ext. Mam. N. America 



1809, 399. 



41 G 



