90 PROCEEDINGS OF THE ACADEMY OF [March, 
ward to Black Canyon (Reed’s) and Morgan Creek. Taken at 
15 stations. 
This is a common shell at high elevations, in the mountains north 
of Hillsboro Peak. Especially in the labyrinth of canyons forming 
the heads of Las Animas Canyon, but also on the western slope of 
the range. Most of the stations are between 8,000 and 9,000 feet. 
It was found mainly under dead wood on shady and rather humid 
slopes. 
Very often the inner of the two basal teeth is wanting, being 
reduced to a sloping callus against the other tooth. 
Ashmunella cockerelli n. sp. Pl. VII, figs. 3, 4,9. 
The shell is umbilicate (umbilicus between one-fifth and one-sixth 
the total diameter, enlarging in the last half whorl, rather tubular 
further in); depressed; carinate at the periphery; the shape recalling 
Polygyra carolinensis and obstricta; wood-brown above, usually 
somewhat paler at the base, having a buff streak indicating a former 
resting stage about the middle of the last whorl. Surface lusterless 
except the earliest whorls. Sculpture of close-set, irregular pebble-like 
granules on the last whorl, finer on the whorl preceding, before which 
it is finely striate and slightly punctate, the first 14 whorls smooth 
and glossy. The inner whorls are convex, the penult whorl flattened, 
the last somewhat convex above, but excavated on both sides of the 
strong peripheral keel. It is rather swollen below the keel, particu- 
larly in the last half. It descends shortly in front, and is guttered 
behind the outer and basal margins of the lip. The aperture is very 
oblique, subcircular and toothless. Lip is reflected and somewhat 
thickened within. 
Alt. 8.2, diam. 16.4 mm.; 5% whorls (type, figs. 3, 9). 
WM cay cae meee Tee 
South of Sawyer’s Peak, on slopes of the ravine at Grand Central 
Mine (Station 20), and in the next two ravines on the trail to the 
peak (stations 19 and 22). Also further north at Station 123, .a short 
distance above Spade’s cabin. 
This species, which it gives us pleasure to name for Professor 
T. D. A. Cockerell, is remarkable for its strong carina and roughly 
pebbly sculpture, which is coarsest on the latter part of the whorl. 
The upper surface is usually convex, but often nearly flat. The 
periphery of the penult whorl frequently projects a little above the 
suture in the individuals with flattened spire. 
