1910.] NATURAL SCIENCES OF PHILADELPHIA. 87 
At Station 6, about half way up the north side of the limestone 
ridge, the shells were like those from the cave in size, but somewhat 
whiter, more calcareous. Near and at the top of the ridge, along the 
southern side, east and west of station 7, O. chiricahuana is widely 
distributed. The shells here are like those from Station 6, but smaller, 
the largest 10 mm. in diameter. This colony is probably 1,500 feet 
higher than the cave. The smaller size of the shells from Station 7 
may probably be correlated with a dryer and hotter habitat. How far 
down the south slope it extends we did not learn. We found O. 
chiricahuana nowhere else in Cave Creek Canyon, nor has the typical 
form been encountered elsewhere. 
Oreohelix chiricahuana percarinata n. subsp. Fig. 11. 
The shell is larger than typical O. chiricahuana, whitish, clouded 
and suffused with flesh color, depressed, with a compressed, projecting 
peripheral keel, the last whorl excavated, concave above and below 
the keel, elsewhere strongly convex. Striation oblique, rather coarse 
and quite irregular above, sharper and strongly arcuate below. Spiral 
Fig. 12.—Summit Cross of J Mountain, seen from the mouth of Big Emigrant Can- 
yon, at X on map, p. 121. Entire range of O. c. percarinata shaded. At 
Station 5 and over much of the slope around Station 6, Sonorella optata 
was found. High granitic spur on left. 
threads few and fine or wanting on the upper surface; on the base 
there are two to four major spirals at wide intervals, with fine spiral 
threads over the whole base. The last whorl rarely falls far below 
the carina at the aperture. Alt. 8, diam. 14 mm.; whorls 5}. 
Summit of Cross J Mountain near the mouth of Big Emigrant 
Canyon, Station 5 on map, p. 121. November 12,1906. This locality is 
farther north than any other known colony of Oreohelix in the Chiri- 
cahua range. The Oreohelices were found around the summit, which 
is probably about 7,500 feet elevation, and along the ridge northward, 
down about 500 feet, but not in the valley (Station 6), where Sonorella 
