244 PROCEEDINGS OF THE ACADEMY OF. [Mch., 
This species differs from A. angulata by its contiguous basal teeth, 
but is"related to it by the punctate surface. It resembles A. duplici- 
dens in some respects, but the basal teeth are not nearly so closely 
united as in that snail, the periphery is carinate, not merely angular, 
and the whole shell is much more depressed. 
Ashmunella duplicidens n.sp. Pl. XVI, figs. 103-107. 
Shell depressed, umbilicate, brown or corneous-brown, glossy and 
sculptured with minute growth-lines only. The spire and base are 
convex, the periphery obtusely subangular in front, and situated above 
the middle of the last whorl. There are 52 to 64 closely coiled, narrow 
and moderately convex whorls, the last one very slightly descending 
in front. The aperture is ear-shaped, very oblique, the lip white, well 
reflexed, and convex on the face. Within the outer margin there is a 
somewhat" retracted broad tooth, prominent at its two ends, concave 
between them. Upon the basal lip there is a less widened, more emerg- 
ing double tooth, the outer cusp larger than the inner. The parictal 
wall bears an oblique, straight lamella. 
Alt. 6.5, diam. 13 mm. 
iti 5.9, 73 12 iz 
Bearfoot or “‘ Bar” Park, Chiricahua Mountains, Arizona, at an 
elevation of 8,500 feet. 
This species is an important link in the A. levette: chain, showing the 
origin of the two basal teeth by splitting of an original median one. It 
is less differentiated from the group of A. thomsoniana than the other 
known Arizona species. 
The genitalia (Pl. X- XJ, fig. 23) also resemble those of thomsoniana. 
The general proportions are shown in the figure and table of measure- 
ments. The penis is comparatively long. The duct of the sperma- 
theca is large, weakly varicose, and contracted where it joins the 
vagina. I did not make out any lower attachment of the penis 
retractor muscle. 
There are about 18.10.1.10.18 teeth, nine or ten being laterals, the 
next three or four transitional. The ectocone is not split on the mar- 
ginals, at least not on most of them. 
Ashmunella angulata n.sp. Pl. XI, fig. 11; Pl. XIV, figs. 55-61, 63, 64. 
The shell is lens-shaped, angular peripherally, rather narrowly um- 
bilicate, glossy, reddish-chestnut when unworn, paler and more cor- 
neous around the umbilicus and in the middle portion of the upper 
surface, but frequently dull throughout by slight wear of the surface. 
Sculpture of very fine and irregular growth-lines, and for a short space 
