290 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
obliquely immersed in the first of the postnuclear turns above which a 
small portion of the tilted edge of the last turn only projects, which gives 
to the shell a decidedly truncated appearance. Postnuclear whorls rather 
high between the summit and the suture very slightly rounded, appressed 
at the summit and very slightly contracted at the periphery, marked by 
very fine lines of growth and numerous, closely spaced, microscopic spiral 
striations. This sculpture is characteristic for the early whorls as well as 
the last. Suture slightly constricted. Periphery of the last whorl strongly 
inflated, rather obtusely angulated. Base short, strongly rounded, narrowly 
umbilicated, marked like the spire. Aperture broadly oval; posterior angle 
obtuse; outer lip thin; inner lip slightly curved, reflected over and ap¬ 
pressed to the base and provided with an oblique fold a little anterior to 
its insertion; parietal wall covered with a thick callus. 
Type in United States National Museum, No. 362450. Type locality, 
San Clemente Island, California. It has five and one-half whorls and 
measures, length, 3.6 mm.; diameter, 1.6 mm. 
Odostomia eyerdami Bartsch, 1927 
Proceedings of the United States National Museum, 70: 18; PI. 4, fig. 1. 
Shell small, very elongate-ovate, bluish white. Nuclear whorls deeply 
obliquely immersed in the first of the succeeding turns above which the 
tilted edge of the last volution only projects. Postnuclear whorls high, 
moderately rounded, very slightly shouldered at the summit, marked by 
moderately strong, equal, and equally spaced spiral striations which have 
about the same strength on all the whorls. Periphery somewhat inflated, 
well-rounded. Base slightly prolonged, well-rounded, marked like the spire 
by lines of growth and spiral striations. Aperture elongate-ovate, protracted 
at the junction of the base and columella; posterior angle acute; outer lip 
thin; columella slightly oblique, almost straight, slightly reflected and ap¬ 
pressed to the base for about half of its length; parietal wall covered with 
a thin callus. 
Type in United States National Museum, No. 362149. Type locality, 
Shuyak Strait, Afognak Island, Alaska. It has five postnuclear whorls and 
measures, length, 4.3 mm.; diameter, 2.0 mm. 
This species is nearest related to Odostomia (Evalea) stephensi Dali 
and Bartsch, from which it differs in being constantly, in every way, 
smaller. 
Odostomia whitei Bartsch, 1927 
Proceedings of the United States National Museum, 70: 19; PI. 4, fig. 3. 
Shell very small, elongate-ovate, bluish white. Nuclear whorls smooth, 
deeply obliquely immersed in the first of the postnuclear turns above which 
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