88° PROCEEDINGS OF THE ACADEMY OF - [Feb., 
lives. This slope of the mountain is limestone, becoming cherty 
above, but the summit is angular, friable quartzite (?), among the 
fragments of which the Oreohelices live. None were found on the 
ridge running toward the mouth of the canyon, which is composed 
of a disintegrating, coarse-grained granitic rock. There is little vege- 
tation of any kind on the upper part of Cross J Mountain. The 
station is rocky, barren and exposed. The snails are moderately 
abundant, though living ones are hard to get. 
Paradise Canyon. On the south side, about two miles below the town 
of Paradise, Oreohelix was found in some abundance, but owing to the 
snow which covered the ground at the time we camped there (November 
20) but few living examples were taken. The form is almost identical 
with that of Cross J Mountain, the adult differing only in having the 
radial striation on the base a little more regular, and the major spirals, 
of which there are three or four, often somewhat stronger, though in 
some shells they are hardly noticeable. In young and half-grown shells 
a thin cuticular thread runs along the summit of each of the strie, 
and at the intersections of the major spirals these threads rise in 
short triangular processes. This feature was not observed in the 
shells from Cross J Mountain. 
Another similar lot was taken on the northern slope of the canyon. 
These places are probably not far from the 6,000 feet contour, being 
thus much lower than Cross J Mountain. 
The separation of these colonies from the Cross J Mountain colony 
of O. c. percarinata probably indicates independent evolution of 
the same characteristics, since an area occupied by O. chiricahuana 
obsoleta lies between Big Emigrant and Paradise Canyons. 
Oreohelix chiricahuana obsoleta n. subsp. Fig. 13. 
In White Tail Canyon, this form of O. chiricahuana was taken at 
Stations 1, 2, 3, 6, 7, 8, 12, 14—all on the southern side except 3, 
which is just over the crest of the ridge on the Pinery side. The 
sculpture is rather rude and blunt, the striation less sharp than in 
the Cave Creek form, being effaced or subobsolete especially on the 
base where spiral lines are wanting or rarely weakly indicated, while 
Cave Creek chiricahuana has sharp, subregular striation and distinct 
spirals. Two or three inner whorls are brown, the rest being white 
with some faint gray streaks and scattered dots. Whorls 54 to 54 
(44 in typical chiricahuana), the last carinated as in chiricahuana. 
The shape varies from typical to decidedly more elevated, and the size 
everywhere exceeds that of Cave Creek shells. A series from the 
typical Station 14, where it is abundant, measures: 
