332 PROCEEDINGS OF THE ACADEMY OF [May, 
abundant at the summit near and north of the small stone ‘‘monu- 
ment” or cairn which marks the summit, on and under stones. Also. 
on the precipitous western slope at Station 10. 
The species is very uniform in all its characters. The size varies. 
from 14 to 16 mm. diameter, and in some shells the last whorl descends 
more than in others. Very few have the parietal callus thickened 
and a little raised. It differs from all forms of O. strigosa by its 
convex, radially costellate embryonic whorls, but in many adult 
shells this sculpture is effaced. O. ferrisst is probably the most 
nearly related species, though very different. 
Oreohelix hachetana cadaver n. subsp. Plate VI, fig. 2. 
The shell is larger than hachetana, the periphery rounded in adults 
except near the aperture in front, where it is distinctly angular. 
Umbilicus smaller, one-sixth the diameter of the shell. 
Alt. 11.5, diam. 18.5 mm.; barely 5 whorls. 
Station 5, below the cliffs on the north side of the summit of 
Daniels Mountain, Daniels and Pilsbry, August 22d, 1910. 
Only a few long-dead shells were found in this thirsty place, where, 
at the base of the cliffs there are a few small pinyon pines, mostly 
dead or moribund. Holospira and Ashmunella mearnsi live here in 
abundance. 
A young shell, long dead, found at Station 6, may belong to the 
same variety. 
Oreohelix (Radiocentrum) ferrissin.sp. Plate VI, figs. 4 to 5d. 
The shell is openly umbilicate, umbilicus conic, over one-fourth 
the total diameter; slightly convex above, base strongly convex; 
thin, light dull brown. The embryonic shell of 13 convex whorls 
is finely lamellose striate radially (fig. 5d). Post-embryonic whorls” 
have the surface densely lamellose along growth-lines, the lamellze 
rising in triangular cuticular processes where they cross the spiral 
ridges of the shell. When denuded, the shell has a blunt, projecting 
peripheral carina; the upper surface has a wide, somewhat angular 
spiral ridge upon all the post-embryonic whorls, sometimes with one 
or two minor ridges; the lower surface has three to five low spiral 
ridges and some minute, weak spiral strie; the whole shell being 
closely thread-striate along growth-lines. The last whorl usually 
does not descend in front. Aperture oblique, irregularly rounded, 
lip simple, the margins rather widely separated, parietal callus thin. 
Shells denuded of the cuticular processes measure: 
Alt. 6.5, diam. 14.5 mm.; 43 whorls. 
£56 pea eta bce 
