266 PROCEEDINGS OF THE ACADEMY OF [Mcll., 



Mr. Ferriss difl not find S. dalli. He thinks that Tanner's is another 

 name for Gar:lc'n Canyon of the sketch map on p. 212. 

 Sonorella virilis n. sp. PL XVII, tigs. :5, ifi. 



The shell is openly umbilicate ; pale brown, lighter around the um- 

 bilicus, with a dark band above the periphery, and visible on about 2^ 

 whorls above the suture, with borders a trifle paler than the ground 

 color. Whorls 4^, the earlier 1^ forming a slightly rugose embryonic 

 shell. The next 1 or 1^ whorls arc striate, the striie appearing slightly 

 broken into granules. The last whorl has the usual slight growth-lines . 

 and near the end some spiral lines are visible, in the vicinity of the 

 suture. The whorl descends rather deeply, and is well rounded 

 peripherally. The aperture is rather large, oblique and rounded, the 

 upper, outer and basal margins about equally arcuate. The outer and 

 basal margins of the thin lip are slightly expanded. Alt. 11, diam. 19.5, 

 umbilicus 3.1 mm.; aperture 9.3 mm. high, 10 wide. 



Chiricahua Mountains, at 7,500 feet elevation, collected by V. Owen. 

 Type 79,622, A. N. S. P. 



There are no longitudinal lines on the sole. The pebbly-granose back 

 and the eye-stalks are blackish-gray, becoming much paler dirty brown- 

 ish-white on the sides and tail. Dorsal grooves are but weakly indi- 

 cated, and there is no longitudinal median line on the tail. 



The kidney is wedge-shaped, 15 mm. long. Pericardium 5.5 mm. 

 long. 



Genitalia (PI. XX, figs. 21, 22). The penis is relatively enormous, 

 more than dovible the length of the vagina, and much longer than the 

 spermatheca and its duct. It has the usual thin wall, enclosing a 

 fleshy "papilla" about 29 mm. long (fig. 21). The epiphallus is also 

 very long, slender and convoluted. The vagina is mucli convoluted. 

 The spermatheca has the usual globular shape ; and its slender duct, 

 while long, is shorter than in other species of equal or greater size. 



The jaw (PI. XXIII, fig. 21) has four broad ribs grouped near the 

 middle. 



S. virilis is slightly smaller than *S'. hachitana, with more rounded 

 aperture and weak spiral lines near the suture. From the shell 

 alone I would not separate this form more than varietally from S. 

 hachitana ; but the enormously developed cJ^ rej^roductive organs indi- 

 cate one of the most distinct species of the genus. The jaw has few 

 ribs, as in S. h. howiensis. It is not closely related to any other species 

 I have dissected. 



The faint spiral lines of the shell are perhaps its most important 

 differential feature. 



