250 PROCEEDINGS OF THE ACADEMY OF [Mch., 
The penis has low, slowly spiral ridges. The entire length of the organs 
exserted is about 3.2 mm. 
The jaw has about 7 unequal ribs. 
The teeth number about 16.12.1.12.16, the tenth to thirteenth being 
transitional. Both cusps of the marginal teeth are bifid. 
Five shells taken in Sawmill Canyon, running from Bear Park, 
Chiricahuas, are like the types. The periphery in some is not quite so 
angular. The punctulation is identical. Two measure: 
Alt. io 7 mm. 
Diam. 16.3 14.8 
Whorls 64 64 
Group of A. chiricahuana. 
Aperture toothless. Epiphallus and duct of the spermatheca very 
much longer than in species of any of the other groups, the diameter 
of the shell contained four times in the length of the penis, epiphallus 
and flagellum. 
Ashmunella chiricahuana (Dall). Pl. XVI, figs. 96-100. 
Polygyra chiricahuana Dall, Proc. U. 8. Nat. Mus., XVIII, p. 2, 1895 (Fly 
Park, Chiricahua Mountains); Proc. U.S. Nat. Mus., XIX, p. 341, Pl. 32, 
figs. 9, 10, 12, 1896. 
Ashmunella chiricahuana (Dall), Pils. and Ckll., Proc. Acad. Nat. Sci. Phila., 
1899, p. 192; Ancey, Jour. of Malacol., VIII, September, 1901, p. 76, with 
var. varicifera, p. 77. 
This species has the general shape and rounded periphery of A. 
levettet. It varies from chestnut to rather light greenish-brown, and 
shells which have lost their cuticle are dull flesh-colored. It is very 
glossy and smooth, marked with weak growth-wrinkles and engraved 
spirals, which are distinct in some, almost obsolete in other specimens. 
Under the compound microscope fine spiral striz are seen to cover the 
surface between the spiral lines. Whorls about 54, slightly convex. 
The last descends a trifle in front, and is somewhat constricted behind 
the lip. The aperture is without teeth. The lip is narrow, reflexed, 
brownish above and at the edge, without trace of lip-teeth. The umbili- 
cus opens rather widely at the last whorl. 
There is almost always an opaque yellow stripe on the last whorl, 
marked inside by a strong white rib, and indicating a place of growth- 
arrest. Some shells have several such variceal streaks on earlier whorls 
also. The feature is a variable one in shells of the same lot, for reasons 
I have elsewhere discussed in full. In one lot of 16 specimens from 
Cave Creek Canyon, Chiricahuas, there are 3 specimens with a single 
streak on last whorl, 8 with 2 streaks on last 2 whorls, 4 with 3 streaks 
on last 3 whorls, and 1 with 4 streaks on last 3 whorls. 
