92 PROCEEDINGS OF THE ACADEMY OF [March, 
widening, convex, the last angular or subangular in front, descending 
a little to the aperture. Umbilicus widening rapidly in the last 
whorl, one-fifth the total diameter. Aperture toothless, rounded, 
lunate, the peristome white, evenly and rather narrowly reflected 
throughout. 
Alt. 7, diam. 15.5 mm.; 5 whorls. (Type, Station 83.) 
Diam. 13.5 to 16.7 mm. (Station 15). 
Black Range at stations 7 and 83, on Silver Creek above the 
““box’’; 138, head of Bull Top Creek, and 15, Spring Creek, a tribu- 
tary of Iron Creek. The type locality, Station 83, is near the deserted 
eabin just above the box of Silver Creek, at ah elevation of about 
8,500 feet. ; 
This species differs from A. mendax by the angularity and the 
microscopic sculpture of the last whorl. Also by the absence of 
any penial retractor muscle attached to the diaphragm. It is far 
smoother than any form of A. cockerel'i, and not carinate. 
It is certainly far less widely spread than A. mendax. We found 
it only in an area of a couple of miles along the western flank of the 
range, from Upper Silver Creek to Upper Spring Creek, well within 
the heavily forested zone. No doubt it will be found over a some- 
what wider area; yet its absence in our many stations both north and 
south indicate that it is a relatively local species. 
Ashmunella mendax n.sp. Pl. VII, figs. 6, 6a, 6b. 
The shell resembles A. mogollonensis, but is less robust, with 
different microscopic sculpture, lighter colored, being between 
tawny-olive and saceardo umber, often with a lighter streak from a 
former resting period. The third and fourth whorls have minute 
growth-wrinkles interrupted to form oblong granules in places, and 
an excessively minute spiral striation. On the last whorl the growth- 
wrinkles are low, unequal and continuous, and there are many weakly 
impressed spiral lines. Last whorl descends slightly in front. The 
aperture is small, toothless; lip white, narrowly reflected. The 
umbilicus is cylindric within, but in the last whorl opens out to more 
than twice its former diameter. 
Alt. 9.8, diam. 20, width of umbilicus 5.2 mm.; 53 whorls. 
Black Range, at the following stations: 2, Gallina Canyon, 
4 miles above Pryor’s upper cabin. Sawyer Peak at stations 18, 
northeast, and 23, east of camp on the saddle, about 20 minutes’ 
walk down the mountain. Stations 16, Iron Creek above confluence 
of Spring Creek, and 163, around Wright’s cabin, near the head of the 
creek. Station 26, Holden’s Spring, at one of the heads of Holden’s 
Prong of Animas Canyon. Station 28, southwest side of Hillsboro 
