2,2 Bulletin American Museum of Natural History. [Vol. XII, 



III. Wasatch. — Continued. 



EDENTATA. 



STYLINODONTID^. 



Calamodon simplex Cope 



Calamodon arcamoenus Cope , 



Calamodon novomehicanus Cope . . . , 

 Dryptodon crassus Marsh 



CONDYLARTHRA. 



PHENACODONTID/E. 



Phenacodus primsevus Cope ' 



Phenacodus omnivorus Cope 



Phenacodus nnnieuus Cope '■ 



Phenacodus wortmani Cope ^ 



Phenacodus apternus Cope 



Phenacodus hem icon its Cope.'' 



Phenacodus brachypternus Cope 



Phenacodus macropternus Cope 



■ ' sulcatiis Cope 



" (Ectocion) osboruianus Cope 



Eohyus '" distans Marsh 



" robustus Marsh 



MENISCOTHERIID^. 



Meniscotherium chamense Cope. . . . 

 " terrae-rubrae Cope. . 



Alcniscotherium tapiacitis Cope 



Hyracops socialis Marsh '' 





u. s. 



A. M. 

 U. S. 

 A. M. 



A. M. 



u. s. 



A. M. 

 Y. 



U. S. 

 A. M. 



Y. 



^ Type from Evanston, Wyoming. 



* Perhaps a small variety of P. prinicEvus. 



* See note on this species on p. 36. 

 ''Doubtfully distinguishable from P. nunzenus. 



^Eohyus Marsh (nom. nud., 1877) is perhaps a synonym of Phenacodus: E. distans 

 (figured, 1894) might be taken for the very uncharacteristic m"' of that genus, and the description 

 of E. robustus (1894) corresponds as far as it goes to the lower jaw of P. primcEvus. Wortman 

 (Bull. Am. Mus. Nat. Hist., 1898, p. loi, foot-note) believes that E. distans is founded on the 

 last upper molar of Trigonolestes etsagicus : but the tooth as figured by Marsh is too large for 

 that species, even on the supposition that m* is unreduced, which, judging from the reduction 

 of the heel of mj, is not the case. 



^Hyracops, which has been identified by Osborn with Meniscotherium, differs considerably 

 in its foot structure if Marsh's figures are accurate. The large magnum, the entirely serial 

 carpus, and the epicuneiform seen in Marsh's figures of Hyracops are not present in Menisco- 

 therium, which has a carpal and tarsal structure very like that of Euprotogonia, with small 

 magnum, lunar supported partly on unciform, and other normal primitive features. The 

 metapodials and phalanges are like those of Hyracops. 



