110 PROCEEDINGS OF THE ACADEMY OF [Feb., 



species was first described, shows that A. ferrissi is related to ^4. angu- 

 lata, a much more widely spread species. 



Genitalia as usual in the group. Basal half of the penis is swollen. 

 As in A. angulata, the retractor muscle of the penis is longer than in 

 A. duplicidens, proximo, etc. The mantle within the last whorl is 

 white (pi. X, fig. 7). 



Group of Ashmunella chiricahuana. 



This group is distinguished by the very long spermatheca and 

 epiph alius and the open aperture, which is either toothless or provided 

 with minute vestigeal teeth which do not sensibly obstruct the opening. 



.4. chiricahuana has never been found to have any trace of teeth. 

 It varies in size and degree of elevation of the aperture. A. esuritor 

 frequently retains minute vestiges of teeth, but they are variable and 

 often hardly noticeable. It is less evolved than A. chiricahuana in 

 retaining this functionless reminiscence of the toothed ancestral form. 

 The series is exactly parallel to the .4. levettei-varicifera series in the 

 Huachucas, but there the degeneration of teeth has been more recent 

 and all stages of the process still exist. 



Ashmunella chiricahuana (Dall). Fig. 23. 

 Proc. A. N. S. Phila., 1905, p. 250. 



This fine Ashmunella is widely distributed in Cave Creek Canyon, 

 living on reasonably moist north slopes where there is good rock 

 shelter, with Sonorella. In 1906 we took specimens at Stations 3, 4, 

 5, 11 , and in the ravines west of Reed's Mountain between that and 

 Station 10. In 1907 and 1908 the following localities were added by 

 Mr. Ferriss : Cave Creek Falls, head of Cave Creek near Long Park, 

 Long Park at 8,000 feet. The types were from the adjacent Fly's Park 

 (No. 124,481 U. S. N. M.). The figures published by Dr. Dall represent 

 A. varicifera, a Huachucan species, and we have therefore given new 

 illustrations. 



The color varies from light brownish-corneous to light chestnut, 

 and occasionally albinos are found. The surface is veiy glossy. 

 Young specimens form a strong wide white rib within the lip when a 

 resting stage occurs. This persists as a yellow blotch or stripe in the 

 adult stage. 



Some specimens, as those from Cave Creek, Station 5, and the head of 

 Cave Creek, show traces of punctation on the intermediate whorls 

 not visible in most others. 



The chief variation, aside from tint, is in the elevation of the spire. 



