36 BULLETIN OF THE 
Polygyrella polygyrella, Buanp. 
Plate I. Figs. 6, 7; Plate VI. Fig. 8. 
Also in Deer Lodge Valley, Montana (Hemphill). 
The genital system (Pl. III. Fig. 8), as would be anticipated, is characterized 
by the length of all the organs. The penis sac (p. s.) is long, narrow, cylin- 
drical, receiving the vas deferens at its blunt apex, and bearing the retractor 
muscle just below. The genital bladder (g. b.) is long, narrow, pointed above 
and below; its duct is long and narrow. The testicle and ovary are long and 
narrow. 
Triodopsis Levettei, Buanp. * 
Plate I. Fig. 15. 
See Supplement to Vol. V. p. 154. | 
Also seventy miles southeast of Tucson, in the Huachuca Mountains, Arizona. 
A species of the Central Province rather than of the Texas Region, as suggested 
in “ Manual of American Land Shells.” 
Triodopsis Mullani, Brann. 
I am convinced by larger suites of specimens that I was wrong in referring 
(Vol. V. p. 333) this species to Mesodon devius. The group is very puzzling, 
and some confusion has resulted from my treatment of it. It must, therefore, 
be considered that Triodopsis Mullani, Bland, as described and figured by him 
is a distinct species confined to the regions east of the Cascades in Northern 
Idaho. It is very globose, with a decidedly tridentate aperture. (See Vol. V. 
p. 338, Fig. 222, and Man. Amer. Land Shells, p. 119, Fig. 87, for a copy of 
Bland’s original description.) The shell I describe below as T. Sanburni is 
somewhat nearly related to Mullani, but has its aperture much more contracted 
by the teeth on the peristome and the more developed parietal tooth. 7. Har- 
fordiana is the form which in Terr. Moll., V. (809, Fig. 203) I mistook for Poly- 
gyra Harfordiana (see Suppl. p. 151). It is a small shining shell, flattened, 
with larger umbilicus and less developed teeth.  T'riodopsis Hemphilli is a 
much larger, coarser, russet-colored shell, scarcely umbilicated, with a small 
parietal tooth, and a slight approach only to the lamellar dilatation of the inner 
edge of the peristome so characteristic of the typical devius ; no denticle on the 
outer edge of the peristome. All these forms show the scars on the epidermis, 
though no hairs were present in my fresh specimens. Besides these well-marked 
forms are found individuals, not associating with them, which seem to connect 
Harfordiana with Mullani (see Terr. Moll., V. Fig. 221, and the following, Pia 
Figs. 6,7). The typical Mesodon devius is confined to the Pacific Province. 
See Terr. Moll., IV. Pl. LXXIX. Fig. 13; V. Fig. 220. It is a very distinct — 
species, as yet not noticed in the Central Province. 
