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



IV. Wind River. — Continued. 



TILLODONTIA. 



ESTHONYCHID/E. 



Esthonyx acutidens Cope 



Esthonyx spatularius Cope 



EDENTATA. 



STYLINODONTID.E. 



Stylinodon {Calamodon) cylindrifer (Cope) 



CONDYLARTIIRA. 



PHENACODONTID^B. 



Phenacodus ? primjevus Cope ' 



Phenacodus wortmani Cope - 



Phenacodus (Ectocion) osbornianus Cope 



AMBLYPODA. 



CORYPHODONTID/E. 



Coryphodon ventanus Osborn 



Coryphodcn wor/mani Osborn 



" ? singularis Osborn 



UINTATHERIID/E. 



Bathyopsis fissidens Cope 



PERISSODACTYLA. . 



EQUID.t:. 



Hyracotherium craspedotum Cope 



Protorohippus (Hyracotherium) venticolus (Cope). 

 Lambdotherium popoagicum Cope ^ 



LOPHIODONTID^. 



Heptodon calciculus Cope 



Heptodon ventortim Cope 



TITANOTHERIID.E. 



Telmatotherium (Palaeosyops) boreale (Cope) . . . . 



Lambdotherium brownianum Cope 



ARTIODACTYLA. 



HOMACODONTID.-E. 

 Trig'onolestes secaiis Cope * 



> be 



2.S 



^^ 



ffiu 



X 



A. M. 



A. M. 



A. M. 



A. M. 



A. M. 



A. M. 



' The single jaw fragment referred to this species differs in several particulars from the 

 Wasatch specimens. 



" Two or three species are apparently included under this name, but the material is too 

 fragmentary for their separation. The Wind River specimens, including the type, are, I be- 

 lieve, distinct from those of Wasatch age, including the complete skeleton described by Cope 

 in ' Tertiary Vertebrata.' Two points of difference are the internal instead of postero-internal 

 position of de on p*, and the more compressed p* — both points approximating the Wind River 

 species to Ectocion^ the most advanced of the Phenacodonts. 



^ See Osborn, Am. Nat., 1897. 



* Upper molars being unknown this species can be placed in TV/^if-iJMo/^ji';?.? only provisionally. 



