280 PROCEEDINGS OF THE ACADEMY OF |Mch., 
but less developed one runs in the middle of the upper surface of the 
last whorl. The embryonic shell of nearly two whorls is not distinctly 
defined from the subsequent growth; the first whorl is smoothish with 
some radial wrinkles only; the second is densely obliquely costulate, 
with cuticular lamelle on the fine riblets in perfectly preserved exam- 
ples. There are weak traces of a few coarse, low spirals. Whorls 4, 
rather rapidly increasing, the last slowly descending in front, very con- 
vex beneath. The aperture is very oblique, shortly pear-shaped, the 
peristome simple, upper and lower margins much converging and 
straightened, connected by a short and thin parietal callous. 
Alt. 7, diam. 13.5 mm., not including the cuticular processes. 
Cave Creek Canyon, Chiricahua Mountains, Arizona, collected by 
J. H. Ferriss. Co-types No. 87,011 and 87,146, Coll. A.N.S. P. It 
lives in a moist situation, in stone talus near the falls of the stream. 
Cuticular processes or ‘“‘hairs”’ are generally present on the shells 
of very young Oreohelices, but in this one alone their development 
culminates in the adult snail. Their projection at the angle of the 
whorls of the spire makes the lamelle look continuous over the sutures. 
When denuded the shell is sharply striate, with some ill-defined spirals 
marking the positions of the more prominent cuticular wreaths. 
Besides those described above, there are some minor and variable 
spirals on the most perfect specimens. 
The processes are very efficient as gatherers of soil, which is probably 
glued on by the mucous of the animal, as usual. In the general plan 
of ornamentation, this bearded Oreohelix is not unlike Polygyra (Steno- 
trema) pilsbryv Ferriss. 
By its tricuspid central and bicuspid lateral teeth, as well as by the 
general form of the shell, O. barbata recalls O. hemphilli, especially ° 
when denuded of the “beard.” The embryonic sculpture is not very 
unlike some forms of hemphilli, but it most resembles that of O. s. 
socorroensis, though a little coarser. The insertion of the penis retrac- 
tor solely on the epiphallus is like Radiocentrwm, and unlike any of the 
typical Oreohelices. 
The foot of O. barbata is small, slate-blackish above, and finely granu- 
lated. No genital furrow is discernible, but there is a pair of dorsal 
grooves. The tail is flattened and pale above. The mantle edge is 
very thick and fleshy. 
The genitalia of one of the types are figured (Pl. XIX, fig. 5). The 
penis resembles that of S. strigosa huachucana, the lower half being 
much swollen, the upper half smaller and cylindric. Internally the 
larger portion has 4 or 5 large and some smaller longitudinal folds, the 
