Vol. 6] Merriam: Virgin Valley and Thousand Creek. 



279 



lower Virgin Valley Beds, Virgin Valley, Nevada. Cotype no. 

 11567 from the same locality. 



Several jaws and teeth from Virgin Valley and High Rock 

 Canon represent a species of Blastomeryx differing only slightly 

 from B. primus and B. oleotti from the Upper Rosebud Beds of 

 South Dakota. The tooth row is slightly longer than in either 

 B. primus or B. oleotti. P x is not represented. On one speci- 



Figs. 56a and 56b. Blastomeryx mollis, n. sp. M 3 . No. 11565, natural 

 size. Virgin Valley Beds, Virgin Valley, Nevada. Fig. 56a, lateral view; 

 fig. 56t>, occlusal view. 



Figs. 57a and 57b. Blastomeryx mollis, n. sp. Fragment of mandible 

 with inferior dentition. No. 11567, natural size. Virgin Valley Beds, 

 Virgin Valley. Nevada. Fig. 57a, lateral view; fig. 57b, occlusal side. 



Figs. 58a and 58b. Blastomeryx mollis, n. sp. Fragment of jaw with 

 P 3 and alveolus of P 2 . No. 12609, natural size. Virgin Valley Beds, 

 High Rock Canon, Nevada. Fig. 58a, inner side of jaw fragment with 

 P 3 ; fig. 58b, occlusal view of P 3 . 



men from Virgin Valley (no. 11567, figs. 57a and 576) a space 

 half the anteroposterior diameter of P 2 is present immediately 

 in front of that tooth but without an alveolus for P,, so that if 



was present it was not situated close to P 2 as in B. oleotti. 

 On a specimen from High Rock Canon (no. 12609, figs. 58a and 

 586) a still larger space anterior to P 2 shows no alveolus for Pj. 

 P., and P 4 arc triangular in cross-section as in B. oleotti and 

 have otherwise much the same form as in that species. 



In the slightly greater length of the tooth row, relatively 

 larger size of the premolars or smaller size of M :j and absence of 

 Pj immediately anterior to P 2 the Nevada form differs from B. 

 oleotti. From B. primus it differs in the triangular rather than 

 oval form of P 4 , in a slightly longer tooth row, and probably in 

 the anteroposterior diameter of the premolars. 



58 a 



