186 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
to its anterior margin, with a tumid area bounding the narrow umbilicus, 
marked like the spire. Aperture oval; posterior angle acute; outer lip 
thin; columella decidedly curved and reflected, provided with a strong 
oblique fold at its insertion; parietal wall glazed with a moderately thick 
callus. Length, 3.1; diameter, 1.4 mm. (Dali and Bartsch.) 
Type in Geological Survey Museum, Ottawa; specimens in United 
States National Museum, No. 211543. Type locality, Barkley Sound, 
Vancouver Island, British Columbia. 
Odostomia calcarella Bartsch, 1912 
Proceedings of the United States National Museum , 42:279; PI. 37, fig. 4. 
Shell very broadly elongate-conic, creamy-white. Nuclear whorls 
obliquely immersed in the first of the succeeding turns. Post-nuclear 
whorls moderately well-rounded, slightly shouldered at the summit, marked 
by decidedly retractive lines of growth and numerous, strong, incised, spiral 
lines. Suture constricted. Periphery of the last whorl subangulated and 
inflated. Base short, narrowly umbilicated, marked like the spire. Aper¬ 
ture large, somewhat effuse anteriorly; outer lip thin, strongly curved and 
reflected, provided with a moderately strong fold a little anterior to its 
insertion. Length, 3.3; diameter, 1.8 mm. (Bartsch.) 
Type in United States National Museum, No. 211587. Type locality, 
United States Bureau of Fisheries Station 2901, in 48 fathoms, off Santa 
Rosa Island, California. 
Range. Known only from type locality. 
Odostomia californica Dali and Bartsch, 1909 
Bulletin 68, United States National Museum, 208; PI. 24, fig. 2. 
Shell small, broadly conic, bluish-white. Nuclear whorls deeply very 
obliquely immersed in the first of the succeeding turns, above which only 
the tilted edge of the last volution projects, the whole giving the spire a 
decidedly truncated effect. Post-nuclear whorls moderately rounded, 
feebly contracted at the suture, appressed at the summit, through which 
the preceding whorl shines, which gives the summit the effect of having 
a double suture. Suture moderately impressed. Periphery of the last 
whorl inflated, weakly angulated. Base short, sloping in a gentle curve 
from the periphery to the umbilical area. Entire surface of spire and 
base marked by decidedly retractive lines of growth and numerous, well- 
incised, spiral striations. Aperture large, ovate; posterior angle acute; 
outer lip thin; columella strongly curved, slightly reflected, re-enforced by 
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