238 PROCEEDINGS OF THE ACADEMY OF [Mch., 
Some specimens of A. thomsoniana from Las Vegas Hot Springs are 
almost as strongly wrinkled or costulate. The subspecies cannot, there- 
fore, be considered to be strongly differentiated. 
Group of A. levettei. 
The aperture has four teeth, but sometimes the two basal teeth are 
contiguous, partially united. The length of the spermatheca and its 
duct is from 55 to 73 per cent. of that of the penis, epiphallus and fla- 
gellum in known forms. 
This somewhat heterogeneous group is characteristic of southwestern 
New Mexico and southeastern Arizona. Here are grouped about ten 
species and subspecies, some of them exceedingly specialized. 
Ashmunella levettei (Bld.). Pl. XV, figs. 72-78. 
Triodopsis levettei Bland, Annals of the New York Academy of Sciences, II, 
1882, p. 115 (cuts); Binney, Manual of American Land Shells, p. 385; Sup- 
plement to Terrestrial Mollusks, Vol. V, p. 154, Pl. 1, fig. E, copy from 
Bland; Second Supplement, in Bull. Mus. Comp. Zool., XIII, No. 2, p. 36, 
Pl. 1, fig. 15, December, 1886. 
Polygyra levettet Bld., Dall, Proc. U. S. Nat. Mus., XIX, p. 341, 1896. 
Ashmunella levettei Bld., Ancey, Journ. of Malac., VIII, p. 74, September, 
1901. 
This is a form of ample proportions, rich dark chestnut color and 
glossy surface. The periphery is rounded, or has a mere trace of angu- 
lation in front. The cylindrie umbilicus enlarges rapidly at the last 
whorl. The spire, while compactly convoluted, has more rapidly 
widening whorls than A. 1. angigyra. The spaces between the three 
lip-teeth are about equal. The parietal lamella has a “kink” or in- 
ward bend at the axial end in the type specimen, but this kink is often 
wanting; being a variable character in levette: and allied species. 
There are about 64 whorls, all convex. The first 14 are smooth and 
glossy except for short strie radiating from the suture; on the second 
whorl these striz extend across the whorl. The following whorls are 
very finely, irregularly marked with faint growth-lines. On the penul- 
timate and last whorls there is a faint, excessively fine and close spiral 
striation, too minute to be visible except witn a compound microscope ; 
and a fine malleation in spiral direction, or spiral impressed lines, 
readily scen with the hand lens or even the naked eye. The periphery 
is rounded. Bland’s type measured, alt. 6.5, diam. 16 mm.; aperture, 
including peristome, 7 x 8 mm., according to the original description. 
Bland evidently measured the altitude of the axis, not of the whole 
shell to the base of the lip. His type, which I have examined, agrees 
with the shells Mr. Ferriss found in Bear and Miller Canyons, in the 
Huachuecas. Figs. 72-75 represent shells from Bear Canyon, agreeing 
with type specimen in all respects. 
