300 PROCEEDINGS OF THE ACADEMY OF [Nov.—Dec., 
embryonic shell about 13 whorls, the first half whorl having some 
radial wrinkles, the rest of the embryonic portion closely irregularly 
granulose, and having fine, rather indistinct, tangential (protractive) 
threads, often visible only near the suture. Subsequent whorls 
have the usual fine growth-lines. The whorls increase slowly at 
first, the last one very wide, suture descending slightly in front. 
The aperture is rounded oval-lunate. Peristome is well expanded, 
Alt. 15.5, diam. 27 mm.; aperture 
alt. 14.8, width 15.8 mm.; 43 whorls. 
Tortillita Mountains, Pinal Co., 
Arizona, the type, No. 118,053, from 
Station 41 (1917), east side of Hog 
Canyon; also found at Station 40, 
west side of same canyon near the 
cement dam, and Station 42, south 
slope of mountains east of Hog 
Canyon. 
Genitalia (Fig. 8). The penis is 
very long and rather slender, with 
muscular walls, containing a long, 
slender, corrugated, tapering papilla. 
The epiphallus is shorter than the 
penis, without a distinct flagellum, 
though there seems to be a rudi- 
mentary one concealed in the integu- 
ment. The penial retractor is long. 
Length of vagina is about equal to 
the penis. 
By the long penis and vagina 
: this species is related to S. rincon- 
Fig. 8. Genitalia of Benard tor. ensis, but in that snail these organs 
tillita with detail of the penis- are far longer. S.santaritana is even 
ponies more like S. tortillita in genitalia, 
but the shell is flatter, the whorls of smaller caliber. None of the 
Santa Catalina species has the vagina and penis nearly so long as in 
S. tortillita. The larger shells referred to S. sabinoensis occidentalis 
are closely similar. 
The embryonic sculpture described is in large part effaced in 
the fully adult shells found. The color, too, is somewhat faded. 
In the young and barely full-grown examples it is decidedly darker 
than described. 
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