238 PROCEEDINGS OF THE ACADEMY OF [Mctl., 



Some specimens of A. thomsoniana from Las Vegas Hot Springs are 

 almost as strongly wrinkled or costulatc. 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 (Bid.). PI. 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 BuU. Mus. Comp. Zool., XIII, No. 2, p. 36, 

 PI. 1, fig. 15, December, 1886. 



Pohjgyra levettei Bid., DaU, Proc. U. S. Nat. Mus., XIX, p. 341, 1896. 



Ashmunella levettei Bid., Ancey, Joum. 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 cylindric umbilicus enlarges rapidly at the last 

 whorl. The spire, while compactly convoluted, has more rapidly 

 widening whorls than A. I. 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 levettei and allied species. 

 There are about 6^ whorls, all convex. The first 1^ are smooth and 

 glossy except for short strise radiating from the suture ; on the second 

 whorl these striae 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 seen 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, 7x8 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 

 Huachucas. Figs. 72-75 represent shells from Bear Canyon, agreeing 

 with type specimen in all respects. 



