510 



PROCEEDINGS OF THE ACADEMY OF 



[Nov., 



This Can- Canyon race is intermediate between typical levettei and 

 hi f urea. 



Ashmunella levettei bifurca n. subsp. 



In Tanner Canyon the shells resemble those of Carr Canyon. They 

 are glossy, dark chestnut colored, depressed, the last whorl angular 

 in front. The aperture is small, the lip-ends connected by a distinct, 

 often heavy parietal cord. The outer lip-tooth is pushed farther back 

 into the mouth. The parietal tooth curves inward at its axial end, and 

 usually gives off a distinct branch from the distal end, though this 

 may be weak or wanting in some examples. The umbilicus is usually 

 wider than in other forms of levettei. The whorls coil closelv. 



Fig. 9. Ashmunella levettei bifurca. Type. 



Alt. 6.6. diam. 15, diam. of aperture 6.9 mm., whorls fully 6i. 



This race is intensified in the development of apertural teeth. 

 A. mearnsi (Dall) is more depressed and has less numerous, less closely 

 coiled whorls. 



The spermatheca is more slender, scarcely sacculate or less con- 

 spicuously so than in other Huachucan species, and is a little enlarged 

 towards the end, the lower part of the duct slender. 



Ashmunella levettei angigyra Pils. 



Proc. A. X. S. Phila., 1905, p. 240, pi. 14, figs. 47-54 (shell); pi. 21, fig. 2S 

 (genitalia); pi. 22, lig. 12 (teeth); pi. 23, fig. 14 (jaw). 



Smaller, more depressed than levettei, and more or less angular at 

 the periphery, teeth contracting the aperture more. 



The types, described and illustrated as above cited, were from 

 Ramsey Canyon (called "Conservatory Canyon" in the original 

 paper). Those from northwestward and along the warm dry slopes 

 of the ridge are more typical of the race, being smaller and more 

 angular. The parietal tooth is straight and rather small, without an 

 outer branch. It occurs along the northeastern side of the range from 

 northwest to southeast as follows : Babokomari Creek; FortHuachuca; 

 Tanner Canyon, over the range, west fork, and along cliffs south of 



