1905.] NATURAL SCIENCES OF PHILADWLPHI A. 279 



flat above it, forming a straightly conic spire. Suture not impressed. 

 The last whorl descends in front. Aperture rather small, as in 0. s. 

 huachucana. Umbilicus ample within, as in hiiachucana. 



Alt. 12 10.2 10.6 mm. 



Diam. 21 19.5 20 



Whorls 4f 5i 5-| 



Mountains near Kingston, Sierra county, New Mexico, collected by 

 0. B. Metcalfe. 



This form stands close to the huachucana series, from which it differs 

 only in the spiral striation of the base, which is usually quite distinct 

 though very minute,^" and in the persistence of the peripheral keel to 

 the aperture. In the last feature it is less evolved than huachucana. 

 In some specimens of the latter the keel also persists, though less 

 strongly. 



Oreohelix strigosa socorroensis n. subsp. PI. XXV, figs. 49-51. 



The shell is thin, with 2\ embryonic whorls closeh^ and sharply 

 obliquely striate, with a few low, coarse, indistinct spirals on the last 

 embryonic whorl. Whorls Ah to 4f , convex, the later ones rudely but 

 not coarsely wrinkled, without noticeable spirals above, but the base 

 is very densely and distinctly striate spirally. The last whorl is quite 

 convex above and below a cord-like peripheral keel, which extends 

 nearly or quite to the aperture. The last whorl descends a little and 

 slowly in front. The umbilicus is rather small, but enlarges at the 

 opening. Aperture as usual. 



Alt. 8 9.2 8 8.8 mm. 



Diam. 15 14.8 13.5 13.3 " 



Negra Mountains, Socorro county. New Mexico. Types No. 58,128, 

 A. N. S. P., presented by Dr. W. D. Hartman, collector unknown. 



Related to 0. s. metcalfei, its neighbor on the south, but that is a 

 more strongly carinate shell with flat whorls and straightly conic spire. 

 They agree in the beautiful circular striation of the base. 



Oreohelix barbata n. sp. PI. XXV, figs. 57, 58. 



The shell is broadly and openly umbilicate, depressed, biconvex, 

 carinate, pale brown, lusterless; obliquely closely lamellose costulate. 

 the lamellae lengthened into a cuticular fringe at the periphery, and at 

 several places on the base, forming circular fringes there. A similar 



*" In some specimens of huachucana from Carr Canyon, such as PI. XXV, fig. 36 

 and figs. 37-40, the base is spirally striate, but it is not so in huachucana from other 

 places. 



