348 PROCEEDINGS OF THE ACADEMY OF [May,. 



longer, but the papilla and epiphallus only slightly or not longer 

 than in hachitana. 



Alt. 16, diam. 27, umbilicus 4 mm. 



120 specimens measure as follows, the upper line being diameters 

 in mm.,^ the lower line the numbers of specimens of each size: 



22 7 2.3 7 24 24.5 25 25.5 26 26.5 27 27.5 28 28.5 29 29.7 

 1 1 10 11 18 12 17 16 1.3 7 3 7 3 1 



The genitalia of S. h. flora (fig. 6, F, G) resemble the same organs 

 in S. hachitana, except that the penis is decidedly and constantly 

 longer, as are also the vagina and spermathecal duct. The penis- 

 papilla is indistinctly annulate and tapers slowly to the apex. The 

 penis-retractor is long and slender, attached to the apex of the penis, 

 and enveloping the base of the epiphallus. Measurements of the 

 organs have been given on page 328. 



The pallial organs are much as in Sonorella optata, but there is no 

 white thread defining the secondary ureter. 



The sole, in alcoholic examples, resembles that of Sonorella bicipitis. 

 It is ochraceous in the middle, pale gray at the sides. Back and 

 flanks dark slate-gray, the tail fleshy-gray above, having an indis- 

 tinct median line. 



Jaw and teeth were described in a former paper of this series. 



Ashmunella walkeri Ferriss. Plate V, figs. 2 to 2e. 



This species was originally described from a few dead shells. We 



found it living in abundance by digging 

 in the soil among the rocks where there 

 was shade. It lives in families or 

 "pockets." The snails are very hard 

 to pull, scarcely any coming out entire. 

 When they do, the shell is very light 

 colored, pale ochraceous salmon or pale 

 brown or entirely white. Old ones are 

 dull, but the best-preserved adults have 



Fig. 7.—sp., spermatheca. a little lustre. 



The genitalia (fig. 7) have no peculiar 

 features. The ducts are rather short. Length of penis 3 ram.; 

 epiphallus 14 mm.; vagina 2.5 mm.; spermatheca 10 mm. The 

 atrium is well developed and the flagellum distinct, though short 

 as usual in the genus. 



8 Except the largest and .smallest, the measurements disregard fractions le-ss^ 

 than half a millimeter, being designed only to show the general size. 



