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— Ee a 
1917.] NATURAL SCIENCES OF PHILADELPHIA. 91 
Ashmunella cockerelli perobtusa n. subsp. PI. VII, figs. 7, 7a. 
The shell is sharply angular in the young, and on the front of the 
last whorl, but becomes rounded and rather swollen in the last third. 
The granulation 1s minute, as in the following race, and in places 
the granules are linked into spiral lines. 
Alt. 7.8, diam. 16 mm.; 54 whorls. 
Locality, Station 21, a ravine about two miles to the left of the 
trail (going down) from the camp site on Sawyer Peak to the Grand 
Central Mine, and at a somewhat higher level than the mine. 
Type No. 115,750, A. N.S. P.; paratypes in Ferriss coll. 
As one of the authors was lost when he found this colony, its exact 
location cannot be made perfectly clear; yet by turning along a 
trail which branches to the left before the steep descent into the 
second ravine from the Grand Central Mine, the snail hunter must 
get into the vicinity of the perobtusa colony. It is in a ravine on 
the left side of said trail. 
Ashmunella cockerelli argenticola n. subsp. PI. VII, fig. 5. 
This form differs from A. cockerelli by the far smoother surface; 
the granulation being very fine, and on the base the granules are 
connected into spiral threads, closely placed, and not visible over 
the whole base. The keel is strong, and continues to the lip, thereby 
differing from A. c. perobtusa. 
Alt. 7.4, diam. 16 mm. (type). 
Upper Silver Creek and its branches, above 7,500 feet, to the 
northern flank of Sawyer Peak, about 500 feet below the summit. 
It was taken at stations 3, 45, 6 and 9 on Silver Creek, 10 and 103 on 
a tributary from the north which enters at Mitchell Gray’s cabin, 
11, gulch south of Gray’s cabin, and 173 near the summit of Sawyer 
Peak. The type locality is Silver Creek just below the box, where 
the trail makes a detour on the steep northern slope. This is proba- 
bly between 8,000 and 8,500 feet, Gray’s cabin being at 7,500 feet. 
In the type locality, Station 43, the diameter is 15 to 16 mm., and 
the keel projects but little or not at all above the suture. Some lots 
vary more. At Station 11 the diameter is from 13.7 to 16 mm., and 
the keel of the penult whorl often projects. In some lots there are 
coarse, conspicuous wrinkles of growth, as at Station 10. The spire 
varies in convexity in all lots, and is often almost flat. 
Ashmunella binneyi n.sp. Pi. VU, fig. 8. 
The shell is depressed, with low but convex spire and angular 
periphery; isabella color above, paler below. Sculpture of very 
minute, interrupted, somewhat anastomosing strie along growth- 
lines; some weak traces of spiral lines on the base. Whorls slowly 
