66 Annals of the Carnegie Museum. 



Family MURID^ Alston. 

 Genus Pareumys gen. nov. 

 13. Pareumys milleri"^ gen. et sp. nov. 



Type: Lower jaw fragment with My and M 3^ in position. C. M. No. 

 2938. 



Horizon: Uinta Eocene, Horizon C. 

 Locality: Six miles east of My ton, Utah. 



Principal Characters revealed by the Type: M-^ and M-^ slightly longer 

 than broad, distinctly quadritubercular with a heavy posterior marginal 

 crest which extends well inward. Longitudinal crests connecting anterior 

 and posterior tubercles. Mj slightly longer than M^- Animal abotit 

 the same size as Eiimys elegans of the Oligocene. 



In comparing the above genus with Eumys elegans 

 Leidy from the Oligocene it is to be observed that M2- 

 and M 3^ are more nearly subequal in size than in the 



Fig. 7. Pareii- latter. In the present genus the molars suggest 

 mys milleri.* Car- , , „ , ^ . , , , ^ 



those of huniys, but are simpler, and are character- 

 negie Museum 



No 2Q10 X 3/1 '^^^'^ ^^ ^^^ absence of a fossette directly anterior to 

 the protoconid; by the absence of a cross-crest from 

 the protoconid to the internal median valley of the molars, and by the 

 fact that the transverse diameter of the posterior portion of M-^ is 

 greater than in Eumys. 



Measurements. 



Antero-posterior diameter of M 2 i-6 mm. 



Transverse " " Mj i-6 



Antero-posterior " " M3 2. 



Transverse " - " M^^ 1.2 



ARTIODACTYLA.'-<^ 

 Subfamily HOMACODONTIN/E. 



Small hunoselenodont Artiodactyls of the middle and upper Eocene 

 with tetradactyl manus and pes; vestigial pollcx (Bunomeryx montanus). 

 Dentition |-' y- |-' f- {Bunomeryx and Hylomeryx, vide infra). Upper 

 molars with small protoconule, or the latter and protocone united into a 



26 In recognition of the work on the Glires (Rodentia by Mr. Gerrit S. Miller, Jr.). 

 Bull. Amer. Mus. Nat. Hist., Vol. X, 1898, p. 97. 



* Outerside of teeth face toward the top of the page. 



26 This section of this paper, dealing with the artiodactyla, was read before the 

 meeting of the Paleontological Society at Pittsburgh, 19 17-18. 



