1905.] NATURAL SCIENCES OF PHILADELPHIA. 261 
The radula is like that of Purtyman’s ranch hachitana in general 
features. The twelfth lateral shows a small ecctocone, larger on suc- 
ceeding teeth. 
Sonorella rowelli (Newcomb). Pl. XVIII, figs. 33-35. 
Helix rowelli Newec., Proc. Cal. Acad. Sci., III, p. 181 (January, een 
S. rowelli (Newc.), Pilsbry, Proc. Acad. Nat. Sci. Phila., 1902, p. 
Shell like S. hachitana, but small, with large mouth aid ae amb) 
cus. Corneous-brown, with a dark band above the periphery, indis- 
tinct pale borders above and below it; somewhat translucent, thin. 
Whorls nearly 44, convex, the first (embryonic) 14 whorls nearly 
smooth, sculptured with some slight radial wrinkles only; following 
whorl or whorl and a half showing some indistinct granulation in places ; 
last whorl with growth-lines only, rounded peripherally, descending a 
little in front. The aperture is large, subcircular, oblique, the thin 
whitish peristome being very narrowly expanded, columellar margin 
dilated. Umbilicus comparatively narrow, partially covered by the 
columellar lip. 
Alt. 9.9 9.6 mm. 
Diam. Lit G36, — 
Umbilicus 25 Pe ae aa 
Alt. apert. 8.5 Seine: 
Diam. apert. 9.5 eo a 
Sanfords, near the eastern border of Pima county, southeastern Ari- 
zona. No. 83,273, A. N.S. P., collected by James H. Ferriss, 1902 
(figs. 33, 34). 
Genitalia (Pl. XX, figs. 13, 14). The penis is short, containing a 
short, cylindric, obtuse papilla. The free portion of the cpiphallus is 
about equal to the penis in length. The flagellum is reduced to a mere 
tubercle, being much shorter than in any other Sonorella yet dissected. 
The vagina is about as long as the penis, and the spermatheca and its 
duct are about four times as long. 
The jaw has 6 or 7 narrow, unevenly spaced ribs. 
The radula has 44.1.44 tecth, like those of S. granulatissima. The 
eleventh and twelfth are transitional. 
The last whorl is less deflexed than in S. h. bowiensis, the aperture 
is larger and the umbilicus smaller. Both penis and vagina are de- 
cidedly shorter, though their proportionate lengths do not differ ma- 
terially, and both have the penis-papilla short and obtuse; but in 
S. rowelli the flagellum is reduced to a minute vestige, unlike any of the 
other species. The remarkable constancy of this organ in the large 
number of individuals of Sonorella and Ashmunella which have been 
