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 8|.) 



Diam. 13.5 to 16.7 mm, (Station 15). 



Black Range at stations 7 and 8|, on Silver Creek above the 

 ''box"; 13, head of Bull Top Creek, and 15, Spring Creek, a tribu- 

 tary of Iron Creek. The type locality, Station 8|, is near the deserted 

 cabin just above the box of Silver Creek, at an 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. cockereV.i, and not carinate. 



It is certainly far less widely spread than A. mendax. We found 

 it onh' 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, 66. 



The shell resembles A. mogollonensis, but is less robust, with 

 different microscopic sculpture, lighter colored, being between 

 tawny-olive and saccardo 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 slightl}' 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. 9.3, diam. 20, width of umbilicus 5.2 mm.; 5| 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 16|, 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 



