1909.] NATURAL SCIENCES OF PHILADELPHIA. 513 
well developed. There are 13 lateral teeth, the 13th being transitional 
to the marginals, which are simple, thorn-shaped. Jaw as usual. 
The penis is large, much twisted, terminates in an obtuse “flagellum” 
or blind sack, and it has a fleshy sensory papilla in the anterior enlarge- 
ment, shown by dotted lines in fig. 8c. In front of this enlargement 
it is very slender. It has an extremely slender retractor muscle 
(p.r.). Other organs as usual in the group. 
Examples from Tanner Canyon have the same genitalia, but differ 
% / 
Fig. 11. Agriolimax hemphilli ashmuni. a, b, alimentary canal and genitalia of a 
specimen from Nogales. c, genitalia of the type from Miller Canyon. 
in external color. They are pale soiled buff, with a slightly darker 
reticulation back of the mantle, which is closely flecked with gray. 
These slugs are therefore not unlike A. hemphilli pictus Ckll. 
According to Mr. Binney, A. hemphilli has 50, 1, 50 teeth with 10 
laterals. This is somewhat unlike our slug, which has more lateral 
teeth, though of the same shape; moreover, the penis of A. hemphilli 
seems to differ from the Arizona form, which occurs in a region other- 
wise wholly diverse in its mollusk population. <A. stenurus and 
A. berendti of Strebel belong to the tropical fauna. Since the Arizona 
form differs materially in dentition from the described alpine slugs of 
Colorado, we have thought it safest to give a special name to the 
mountain slug of Arizona, until such time as the several forms can be 
actually compared by some observer, and their relations to one 
another elucidated. 
The types of A. hemphilli ashmuni are No. 94,366 A. N. 8. P., from 
Miller Canyon, Huachuca Mountains. 
ENDODONTID&. 
Pyramidula (Gonyodiscus) cronkhitei (Newc.). 
Wickersham’s, Miller Peak; Carr Canyon. 
