542 



University of California Publications in Geology [Vol. ll 



facet is, however, not as large as in the puma and is not as well 

 developed on the posterior side. Behind the excavation below the 

 median facet for articulation with metacarpal II there is a small 

 round facet also for contact with metacarpal II. The writer has not 

 seen this facet in the Canidae. It is not present in the puma, the 

 sabre-tooth, or in Felis atrox. On the external side the lower exca- 

 vated face for contact with metacarpal IV is not as deeply cut as in 

 the cats, but is deeper than in Aenocyon dints. The upper portion of 

 the facet for contact with metacarpal IV is broken anteriorly. 

 Unfortunately the writer has not had good material of Aelurodon 

 immediately available for comparison. 



MUSTELA? BUWALDI, n. sp. 



Type specimen a lower jaw with Pi to Mi, no. 21323, from locality 2282, 

 Eicardo beds, Mohave Desert, California. 



A lower jaw with the carnassial and all of the premolars from the 

 Eicardo beds (fig. 154) represents a mustelid not known elsewhere 

 in the Tertiary of the Great Basin province. 



Pi to P., are simple cones without accessory tubercles. P 4 has a 

 posterior cusp. 



M x has a low mustelid or musteline type of crown. The protoconid 

 and paraconid are nearly equal. The metaconid is prominent and 

 sharply separated from the protoconid. The heel is long and basin- 

 shaped. The hypoconid is fairly prominent. A long, curved postero- 

 internal ridge connects posteriorly with the hypoconid and internally 

 with the base of the metaconid. The external cingulum of ~M X is 

 faintly marked on the heel, but is not visible on the outer side of the 

 protoconid, although the teeth are but little worn. 



Measurements of no. 21323 



Length, anterior side Pi to posterior side M, 26.9 mm. 



Pi, anteroposterior diameter 2.4 



P 2 , anteroposterior diameter 4.5 



P 3 , anteroposterior diameter 5 



P 41 anteroposterior diameter 6.1 



Mi, anteroposterior diameter 9.9 



Mi, length of heel on outer side 3 



M„ width of heel 3.9 



