1917.] NATURAL SCIENCES OF PHILADELPHIA. 91 



Ashmunella cockerelli perobtusa n. subsp. Pi. VII, figs. 7, la. 



The shell is sharply angular in the young, and on the front of the 

 last whorl, ])ut becomes rounded and rather swollen in the last third. 

 The granulation is minute, as in the following race, and in places 

 the granules are linked into spiral lines. 



Alt. 7.8, diam. 16 mm.; b\ 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, 4|, 6 and 9 on Silver Creek, 10 and 10^ on 

 a tributary from the north which enters at Mitchell Gray's cabin, 

 11, gulch south of Gray's cabin, and 17^ 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 4|, 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. VII, 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 striae along growth- 

 lines; some weak traces of spiral lines on the base. Whorls slowly 



