216 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
to its insertion; parietal wall glazed with a thin callus. Length, 7.5; 
diameter, 0.4 mm. (Bartsch.) 
Type in United States National Museum, No. 211559. Type locality, 
Nanaimo, British Columbia. 
Range. Known only from type locality. 
Odostomia helena Bartsch, 1912 
Plate 67, fig. 2 
Proceedings of the Ufitted States National Museum, 42:286; PI. 38, fig. 10. 
Shell moderately large, yellowish-white, very elongate-ovate. Nuclear 
whorls small, very obliquely immersed in the first of the succeeding turns, 
above which the tilted edge of the last volution only projects. Post- 
nuclear whorls subtabulately shouldered at the summit, well-rounded, 
apparently marked by incremental lines only. Sutures strongly constricted. 
Periphery of the last whorl somewhat inflated, well-rounded. Base short, 
well-rounded, broadly umbilicated, marked like the spire. Aperture moder¬ 
ately large, ovate; posterior angle obtuse; outer lip evenly curved; inner 
lip sinuous, reflected over, but not adnate to the base, provided with a 
strong, oblique fold, which is about one-third of the distance of the length 
of the inner lip anterior to the insertion of the inner lip. Parietal wall 
covered with a thick callus. Length, 5; diameter, 2.7 mm. (Bartsch.) 
Type in United States National Museum, No. 249904. Type locality, 
San Pedro, California. 
Range. Known only from type locality. 
Odostomia iliuliukensis Dali and Bartsch, 1909 
Plate 62, fig. 4 
Bulletin 68, United States National Museum, 227; PI. 29, fig. 4. 
Shell very elongate-conic, heavy, very light-yellow. Nuclear whorls 
small, almost completely obliquely immersed in the first of the succeeding 
turns. Post-nuclear whorls rather high between the sutures, well-rounded, 
with narrowly tabulate summits, marked by fine, retractive lines of growth 
and numerous fine, closely-spaced, spiral striations. Suture well-marked. 
Periphery of the last whorl well-rounded. Base rather prolonged, evenly 
rounded, marked like the spire. Aperture pear-shaped, posterior angle 
obtuse; outer lip thin at the edge, thickened within; columella twisted, 
strongly curved anteriorly, where it is also reflected and re-enforced by 
the base, provided with a low fold at its insertion; parietal wall glazed by 
a thin callus. Length, 9.5; diameter, 4.6 mm. (Dali and Bartsch.) 
[5141 
