ARTIODACTTLA. 725 



M. 

 Xength of bases of Pm. iv 005 



Diameters basis of M. ii J ''"*«''°P''»*®"»'^ 0075 



( transverse 0070 



Diameter basis M.iii J '">*""?'"'*«"'"■ ^^* 



i transverse 0070 



Depth of ramus at Pm. ii 0080 



Depth of ramus atM. ii 0140 



This species is named from the Crow Indian name of the Big Horn 

 River, Etsagie. Discovered by Mr. J. L. Wortman in the Wasatch beds of 

 the Big Horn River, Wyoming. 



Pantolestes longicaudus Cope. 



Proceed. Araer. Philos. Soe., 1872, p. 467 (August 3). 

 Plate XXIV, figs. 13-17. 



Dental formula M. 3; P. M. 4; C. 1 ; incisors unknown. Some of the 

 molars in the only specimen known are so worn as to preclude exact descrip- 

 tion. They evidently possessed anterior and posterior lobes, separated by 

 a valley, which was most expanded on the inner side. The last molar 

 exhibits a short heel posteriorly, which probably supported a small tubercle. 

 The last three premolars are all two-rooted and compressed in form. The 

 fourth presents a crown composed of one large anterior, compressed cusp, 

 and a much lower posterior heel. There is a slight cingulum in front. 

 The canine is lost, but its alveolus indicates that it was a stout tooth. 



Some caudal vertebrae found with this jaw indicate that the animal 

 possessed a long tail. 



The mandibular ramus is quite slender, and there is a large foramen 

 below the first true molar; the masseteric fossa is pronounced. So far as 

 the known structure goes, this species resembles the P. chacensis, but pos- 

 sesses a much larger heel of the fourth premolar. 



The remains of this species were found together by the writer in the 

 Bridger beds on Black's Fork, Wyoming. 



Pantolestes secans Cope. 



Bulletin U. S. Geol. Surv. Terrs., F. V. Hayden, 1881, p. 187, 

 Plate XXV a, flg. 6. 



Represented by the adherent rami of a mandible, on both of which the 

 _posterior four molar teeth are preserved. 



