88 PROCEEDINGS OF THE ACADEMY OF [INIaich, 



zone fauna of small shells, Vertigo, Pupilla, Vitrina, Thysa?iophora 

 ingersolli, etc., in common with similar elevations as far west as the 

 Santa Catalinas in Arizona. Also the Canadian Oreohelix cooperi. 



List of Species. 



The specimens have been studied by both authors. Types are 

 in coll. A. N. S. Phila.; paratypes in coll. Ferriss. 



HELICID^. 

 ASHMUNELLA. 



The Black Range Ashmunellas resemble those of the Mogollon 

 and Chiricahua Ranges in the genitalia. The penis is more or less 

 distinctly bipartite by a submedian constriction. 



In A. binneyi, A. tetrodon, and in A. mogollonensis of the Mogollon 

 Range, a retractor muscle of a few slender strands attaches to 

 both segments of the penis and to the epiphallus further up, but 

 there is no continuation attaching to the diaphragm. 



In A. mendax and A. cockereUi with its subspecies there is, in 

 addition to the incoherent penial retractor just described, a broad, 

 very thin and extremely short band connecting the epiphallus with 

 the diaphragm. This is similar to the condition in most other 

 Ashmunellas except that the connection with the diaphragm is here 

 very short. 



All of the species have the usual short flagellum, about 1.5 mm. 

 long. The constancy in Ashmunella of this minute, seemingly 

 vestigeal organ is remarkable. 



Aside from the particulars noted above, the organs are much alike 

 in the several species. For convenient comparison the measurements, 

 in millimeters, are given in one table, .4. mogollonensis being added 

 for comparison. 



Ashmunella tetrodon Pils. and Ferr. 



Ashmmella tetrodon P. & F., Xautilus, XXIX, June, 1915, p. 15, PL 1, 

 figs. l-3a. 



Southern slope of the San Mateo ]Mountains, Socorro County, 

 New Mexico. 



This species was described from the western slope of the Mogollon 

 Mountains, and its occurrence in the San Mateo Range appears 

 anomalous. The numerous specimens obtained are quite constant, 

 showing none of the variations noted in the INIogollons. 



The genitalia of one of these specimens are figured, PI. X, fig. 6-. 



