2io.8.] COPE ON EOCENE VERTEBBATA OP WIND RIVER. 201 



Measurements. 



M. 

 Lengthof true molar series ..., ,0390 



■f^ . If ji 1. J 1 (anteroposterior i.k..* =»0107 



Diameters of first true molar < ^ ^ ^^^ 



I transverse ..» 0097 



T-w i j?xt..jj 1 (anteroposterior •OlSO 



Diameters of tnird true molar < , . ^ , „, „„ 



i transverse in front .0100 



GENERAL OBSEKVATIONS. 



Until the fauns© of the Wasatch and Bridger epochs are better known 

 it will not be possible to fix the relation which that of the Wind Eiver 

 beds holds to them. It is, however, quite evident that in some respects 

 it differs from both, both by what it possesses and what it lacks. In 

 the following lists these differences are displayed so far as they relate 

 to genera. The left-hand column represents the Wasatch, the middle 

 the Wind Eiver, and the right hand the Bridger. 



Wasatch. Wind River. Bridger. 



Clastes Clastes. Clastes. 



Pajppichthys. Pappichthys. 



Crocodilus. Crocodilus. Crocodilus. 



Plesiarctomys. Plesiarctomys. Plesiarctomys. 



Myops. 

 Vesperugo. % Yesperugo. 



Calamodon. Calamodon. 



Estlionyx. Esthonyx. 



Ectoganus. 



AncMppodus. 

 Ictops. fictops. 



Mesonyx. 

 Miacis. Miacis. 



Bidymictis. Didymictis. ? 



Oxycena. ? 



PacJiycena. ? 



Protopsalis. ? 



Stypoloplms. StypolopTius. Stypolophus. 



Microsyops. Microsyops. 



Pantolestes. Pantolestes. Pantolestes. 



Pelycodus. Pelycodus. ? 



Tomitherium. 

 AnaptomorpJius. 

 CorypJiodon. Corypliodon. 



Bathyopsis. 



TJintatlierium. 

 PalcBosyops. Palceosyops. 



Lamhdotherium. ? 



fPachynolophus. Pachynolophus. 



Hyracotlierium. Hyracotlierium. ? 



Orotherium. Orotlierium. ? 



Hyracliyus. 



Phenavodus. Phenacodus. 



