384 PROCEEDINGS OF THE ACADEMY OF [June, 
VALLONIIDZ. 
Vallonia perspectiva Sterki. 
Dragoon Mountains: Stations 1, 6, 10, 15, 25, 26, 28, 29. In 
copious numbers. 
Il. Toe Mute Mountains. 
This group is between the southwestern outliers of the Chiricahua 
Range and the Huachucas, and is much lower than either, the highest 
summits about 7,000 feet. The greater part of the group is igneous 
rock, but the Escabrosa Ridge, running along the western and 
southern borders, is limestone. Collecting was done in the vicinity 
of Bisbee and Warren, August 29 and 30, 1910, by Daniels and 
Pilsbry. We found nothing in the igneous area, but Sonorella 
probably lives on the higher peaks. 
The Geological Survey has published a topographic sheet of this 
region. 
Sonorella bartschin.sp. Pl. VIII, figs. 4, 4a, 46. 
The shell is strongly depressed, rather openly umbilicate (width 
of umbilicus contained nearly six times in the diameter of shell), 
moderately strong, though thin; color between cinnamon and wood 
brown, fading to white around the umbilicus, and encircled above 
the periphery with a dark chestnut band, bordered above and below 
with white bands, as wide as the dark band or wider. Surface 
glossy; initial } whorl of the embryonic shell smooth; a few radial 
wrinkles follow, after which it has radial striae which become more 
or less interrupted, forming irregular, long granules; beginning with 
the second whorl, there are short hairs, subregularly placed in for- 
wardly descending rows; these continue to the penultimate whorl, 
where they weaken and disappear. The last whorl has a weak sculp- 
ture of growth wrinkles only. 
Whorls about 43, rather slowly increasing, convex, the last descend- 
ing well below the periphery in front. Aperture strongly oblique, 
subcircular. Peristome thin, expanded rather slightly above, 
strongly below, the ends approaching and joined by a very short 
but distinct parietal callus. 
Alt. 11.2, diam. 20 mm.; aperture 9.7 x 10.5 mm.; umbilicus 3.5 
mm. wide; whorls 43. 
Alt. 10.2, diam. 18 mm.; aperture 8x 9 mm.; umbilicus 3.3 mm. 
wide; whorls 43. 
The back and tentacles are slate colored, sides gray. The sole 
shows no longitudinal divisions or areas. 
