110 PROCEEDINGS OF THE ACADEMY OF [Feb., 
species was first described, shows that A. ferrissi is related to A. angu- 
lata, a much more widely spread species. 
Genitalia as usual in the group. Basal half of the penis is swollen. 
As in A. angulata, the retractor muscle of the penis is longer than in 
A. duplicidens, proxima, etc. The mantle within the last whorl is 
white (pl. X, fig. 7). 
Group of Ashmunella chiricahuana. 
This group is distinguished by the very long spermatheca and 
epiphallus and the open aperture, which is either toothless or provided 
with minute vestigeal teeth which do not sensibly obstruct the opening. 
A. chiricahuana has never been found to have any trace of teeth. 
It varies in size and degree of elevation of the aperture. A. esuritor 
frequently retains minute vestiges of teeth, but they are variable and 
often hardly noticeable. It is less evolved than A. chiricahuana in | 
retaining this functionless reminiscence of the toothed ancestral form. 
The series is exactly parallel to the A. levettei-varicifera series in the 
Huachueas, but there the degeneration of teeth has been more recent 
and all stages of the process still exist. 
Ashmunella chiricahuana (Dall). Fig. 23. 
Proc. A. N.S. Phila., 1905, p. 250. 
This fine Ashmunella is widely distributed in Cave Creek Canyon, 
living on reasonably moist north slopes where there is good rock 
shelter, with Sonorella. In 1906 we took specimens at Stations 3, 4, 
5, 11, and in the ravines west of Reed’s Mountain between that and 
Station 10. In 1907 and 1908 the following localities were added by 
Mr. Ferriss: Cave Creek Falls, head of Cave Creek near Long Park, 
Long Park at 8,000 feet. The types were from the adjacent Fly’s Park 
(No. 124,481 U.S.N.M.). The figures published by Dr. Dall represent 
A. varicifera, a Huachucan species, and we have therefore given new 
Ulustrations. 
The color varies from light brownish-corneous to light chestnut, 
and occasionally albinos are found. The surface is very glossy. 
Young specimens form a strong wide white rib within the lip when a 
resting stage occurs. This persists as a yellow blotch or stripe in the 
adult stage. 
Some specimens, as those from Cave Creek, Station 5, and the head of 
Cave Creek, show traces of punctation on the intermediate whorls 
not visible in most others. 
The chief variation, aside from tint, is in the elevation of the spire. 
