No. 8.] COPE ON EOCENE VERTEBEATA OF WIND EIVER. 199 



Measurements. 



M. 



Length of consecutive superior molars 04500 



Length of diastema between Pm. I and II 00350 



Length of second premolar 00700 



Width of second premolar posteriorly 00500 



T^• . ^ XI 1 (anteroposterior 00700 



Diameters fourth premolar < -^ „ 



i transverse 00900 



Diameters second true molarj anteroposterior 00850 



i transverse 01120 



Length of entire inferior premolar series 05800 



Length of entire inferior true molar 00282 



T^. i ji J. J. 1 (anteroposterior 00800 



Diameters first true molar < ^ „„„„« 



c transverse 00600 



T^. J. 1 i J. 1 (anteroposterior 01200 



Diameters last true molar < ^ /^r./^r« 



c transverse 00d5U 



Depth of ramus at fourth premolar - 01650 



Depth of ramus at third true molar in front 01650 



The lower jaw of a second individual agrees with the type in its pro- 

 portions. 



41. Hyracotherium craspedotum Cope. 



American Naturalist, 1880, p. 747. 



Size of S. tapirinum, but the tubercles of the inferior molars are not 

 connected by cross-crests, and they all possess a strong external basal 

 cingulum, which also extends round on the posterior base of the I and II 

 true molars. Heel of fourth premolar with a diagonal ridge; two ante- 

 rior cusps well separated, and no tubercle in front of them* Second 

 premolar with narrow heel ; last true premolar with wide heel. Length 

 of molar series, .056; of true molars, .033; of last molar, .014; depth of 

 ramus at second premolar, .018 ; at last true molar, .023. 



This is the largest species of the genus found in the Wind Eiver beds. 

 Parts of two individuals were obtained by Mr. Wortman. 



42. Orotherium vintanum C' Marsh") Cope. 



Report Espl. Surv. W. of 100th Mer, iv, p. 255. 



A portion of the mandible of a single specimen, containing the charac- 

 teristic fourth premolar and other teeth. 



ARTIODACTYLA. 



A species of this order is represented by an astragalus. This is the 

 first indubitable evidence of the existence of this order duriiig the 

 Wasatch epoch that I have seen. The following species are referred 

 here provisionally only, as no part of their skeletons is known. 



43. Phenacodus vortmani Cope. 



Hyracotherium vortmani, American Naturalist, 1880, p. 747. 

 This species is represented by portions of mandibles of four individ- 

 uals. One of these supports the posterior four molars, another the pos- 

 terior two, and another the last premolar and first true molar. 



