218 MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
face decidedly eroded). Periphery and base of the last whorl well- 
rounded, the latter with a minute umbilical chink. Aperture auricular, 
somewhat effuse anteriorly, posterior angle scarcely acute; outer lip very 
thick, reflected, pillar with a broad, strong, oblique fold, a little anterior 
to its insertion; parietal wall covered by a thick callus. (Dali and Bartsch.) 
Type in Killisnoo Museum, Berol, No. 36336. Type locality, Verbre- 
tung, Japan. 
Range. Kodiak to Killisnoo, Alaska. 
Odostomia lastra Dali and Bartsch, 1909 
Plate 64, fig. 7 
Bulletin 68, United States National Museum, 219; PI. 28, fig. 7. 
Shell thin, large, elongate-ovate, tapering very regularly to an acute 
point, narrowly umbilicated. Nuclear whorls very small, deeply obliquely 
immersed in the first of the succeeding whorls, above which only the 
tilted edge of the last volution projects. Post-nuclear whorls well-rounded, 
moderately constricted at the sutures and narrowly shouldered at the 
summit, marked by numerous slender wavy spiral striations and fine lines 
of growth which give the surface a somewhat malleated appearance. 
Periphery and base of the last whorl strongly rounded, the latter narrowly 
umbilicated, marked like the spire. Aperture large, broadly oval, slightly 
effuse anteriorly; posterior angle acute; outer lip thin; columella slender, 
very oblique, almost straight, and somewhat reflected; parietal wall glazed 
with a thin callus. Length, 13.6; diameter, 7 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 206928. Type locality, 
United States Bureau of Fisheries Station 2917, in 90 fathoms, off 
southern California. 
Range. Catalina Island to San Diego, California. 
Odostomia martensi Dali and Bartsch, 1906 
Plate 62, fig. 3 
Proceedings of the United States National Museum, 30 :361; PI. 25, fig. 5. 
Shell ovoid, heavy, yellowish-white. Nuclear whorls small, almost 
completely immersed in the first of the succeeding volutions. Post-nuclear 
whorls increasing regularly and rapidly in size, inflated, subtabulately 
shouldered at the summit, marked by numerous fine lines of growth and 
equally abundant, closely placed, wavy, spiral striations. These lines of 
growth and spiral markings give the surface a finely reticulated appearance 
when viewed under high magnifications. (We have omitted this sculpture 
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