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. 8 c. 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. S. P., from 

 Miller Canyon, Huachuca Mountains. 



ENDODONTICS. 



Pyramidula (Gonyodiscus) oronkhitei (Newc). 

 Wickersham's, Miller Peak; Carr Canyon. 



