CLASS GASTROPODA 
81 
shouldered at the summit, well-rounded on the sides, marked by fine, incre¬ 
mental lines only. Suture strongly constricted. Periphery of the last 
whorl inflated. Base moderately long, well-rounded, narrowly umbilicated, 
smooth, excepting incremental lines. Aperture large, oblique, broadly oval; 
outer lip thin; columella curved and slightly reflected; parietal wall cov¬ 
ered with a thick callus which renders the peritreme complete. Length, 
2.7; diameter, 2 mm. (Bartsch.) 
Type in United States National Museum, No. 206103. Type locality, 
Windfall Harbor, Admiralty Island, Alaska. 
Cingula montereyensis Bartsch, 1912 
Plate 84, fig. 1 
Proceedings of the United States National Museum, 41:488; PI. 41, fig. 1. 
Shell elongate-conic, light brown. Nuclear whorls one and one-half, 
well-rounded, smooth. Post-nuclear whorls appressed at the summit, mod¬ 
erately rounded, with a very narrow umbilical chink, smooth, excepting 
fine, incremental lines. Aperture broadly oval, somewhat efifuse anteriorly; 
posterior angle obtuse; outer lip thin; columella curved; parietal wall 
glazed with a moderately strong callus, which joins the posterior angle of 
the aperture with the insertion of the columella. Length, 4; diameter, 2.1 
mm. (Bartsch.) 
Type in United States National Museum, No. 127547. Type locality, 
Monterey, California. 
Range. Known only from type locality. 
Cingula californica Tryon, 1865 
American Journal of Conchology, 1:221; PI. 22, fig. 11. 
Shell turbinated, consisting of six rather convex whorls; spire ele¬ 
vated, apex acute, suture well impressed; aperture moderate, ovate; 
umbilical region not perforate; epidermis minutely striated, polished, dark 
horn color; operculum thin, shining, dark brown. Length, .13; diameter, 
.09; length of aperture, .06; breadth, .04 in. (Tryon.) 
Type in Tryon Cabinet. Type locality, Oakland, California. 
Range. San Francisco Bay to San Pedro, California. 
Cingula orvieta Dali, 1919 
Proceedings of the United States National Museum, 56:351. 
Shell minute, olive brown, thin, turbinate, of about three rounded 
whorls, the surface smooth, not polished, the suture distinct; the base 
convex, imperforate; the aperture subcircular, simple, a chink behind the 
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