224 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Aperture large, oblong-ovate, slightly effuse anteriorly; posterior angle 
very obtuse; outer lip thick within, thin at the edge; columella curved, 
somewhat twisted, strongly reflected, provided with a strong fold a little 
anterior to its insertion. Length, 6.9; diameter, 3.5 mm. (Dali and 
Bartsch.) 
Type in United States National Museum, No. 168801. Type locality, 
San Pedro, California. 
Range. Santa Barbara, California, to Todos Santos Bay, Lower 
California. 
Odostomia talpa Dali and Bartsch, 1909 
Bulletin 68, United States National Museum, 222; PI. 27, fig. 9. 
Shell stout, rough, very broadly conic, narrowly umbilicated. Nuclear 
small, deeply obliquely immersed in the first post-nuclear turn. Post- 
nuclear whorls with quite strong concavely shouldered summits, the rest 
well-rounded (usually showing decided erosion marks, which coincide 
largely with the lines of growth). The parts bearing the original surface 
show traces of exceedingly fine spiral striations. Periphery and base of 
the last whorl rather inflated, well-rounded, the latter narrowly umbili¬ 
cated, marked like the spire. Aperture broadly oval, posterior angle 
obtuse; outer lip rather thick, columella stout, thick, somewhat flexuous 
and reflected, provided with a strong fold a little anterior to the umbilicus; 
parietal wall covered by a thin callus. Length, 8; diameter, 3.8 mm. 
(Dali and Bartsch.) 
Type in United States National Museum, No. 204027. Type locality, 
Mole Harbor, Alaska. 
Range. Mole Harbor and Sitka Harbor, Alaska. 
Odostomia washingtonia Bartsch, 1920 
Journal of the Washington Academy of Sciences, 10:571. 
Shell moderately large, broadly elongate-conic, pale horn-colored. Nu¬ 
clear whorls too eroded to permit of description. Post-nuclear whorls 
strongly tabulatedly shouldered at the summit, moderately rounded, marked 
by decidedly retractively slanting lines of growth and numerous very finely 
incised spiral striations. Sutures conspicuously marked by the tabulated 
summit. Periphery of the last whorl inflated, strongly rounded. Base 
short, inflated, and strongly rounded, marked like the spire. Aperture 
rather large, almost subquadrate, slightly oblique; posterior angle obtuse; 
outer lip flexuose, reflected over the base, but not appressed, the axis being 
decidedly protractively slanting. A strong columellar fold is present at 
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