280 



University of California Publications. 



[Geology 



No. 



No. 



No. 



No. 



No. 



No. 



11565 



10061 



11567 



11506 



12609 



11564 







31.3 mm. 













5.4 













7.8 





8.5 



7.8 





8.9 



9.1 



8.5 



8.8 



8.8 





9. 



9.2 



9.5 



8.8 



8.5 









10.3 



10. 



9.8 



13.8 











13. 



The stage of advance of this species is close to that of B. 

 primus and B. olcotti, and it may possibly be united with one of 

 these forms when more material is available for study. 



Measurements 



Length, anterior side P 2 to posterior side 



M, 



P.,, anteroposterior diameter 



P 3 , anteroposterior diameter 



P 4 , anteroposterior diameter 



M u anteroposterior diameter 



M 2 , anteroposterior diameter 



M„ anteroposterior diameter 



M 3 , transverse diameter 7.3 



Length, anterior side P 3 to posterior side 



M 3 45.5 



Height of mandible below P, 14.3 



Height of mandible below M, 14.9 14.2 



DROMOMERYX, sp. a, near BOREALIS (Cope) 

 Several jaws and teeth from Virgin Valley correspond very 

 closely to forms which have been referred to Palaeomeryx, and 

 have recently been designated as a new genus, Dromomeryx, by 

 Douglass. 23 



A single upper molar, described and figured by Gidley 24 was 

 referred by him tentatively to Palaeomeryx (1) borealis. 



Several fragments of jaws with teeth, and a lower molar, 

 M 3 (fig. 62), belong to an animal about as large as that repre- 

 sented by the upper molar described by Gidley. On specimen 

 no. 12601 the palaeomeryx fold is well marked on M x , and is 

 faintly shown on M 2 . The basal tubercle between the proto- 

 conid and hypoconid is large. There is a distinct anterior basal 

 ridge as in the specimens from Snake Creek recently referred to 

 Palaeomeryx by Matthew and Cook. 25 



The anteroposterior dimension of M 3 is near that of the 

 Palaeomeryx species from Snake Creek. On this tooth the 

 palaeomeryx fold is only suggested, the basal tubercle between 



23 Douglass, Earl, Ann. Carneg. Mus., vol. 5, p. 461, 1909. 



24 Gidley, J. W., Univ. Calif. Publ. Bull. Dept. Geol., vol. 5, p. 241, 1908. 

 2"> Matthew, W. D., and Cook, H. J., Bull. Am. Mus. Nat. Hist, vol 26 



p. 408, 1909. 



