188 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
provided with a fold some little distance anterior to its insertion; parietal 
wall glazed with a moderately thick callus. Length, 4.2; diameter, 2 mm. 
(Bartsch.) 
Type in United States National Museum, No. 211557. Type locality, 
United States Bureau of Fisheries Station 4322, in 110 to 199 fathoms, off 
Point La Jolla, California. 
Range. Known only from type locality. 
Odostomia capitana Dali and Bartsch, 1909 
Bulletin 68, United States National Museum, 200; PL 26, fig. 7. 
Shell elongate, oval, umbilicated, light yellow. Nuclear whorls small, 
deeply, very obliquely immersed in the first of the succeeding turns. 
Post-nuclear whorls well-rounded, with strongly rounded summits. Entire 
surface marked by fine lines of growth and exceedingly numerous, very 
fine, wavy, spiral striations. In addition to these markings the whorls are 
covered by eight very slender, subequally spaced, obsolete threads between 
the sutures and four which are considerably stronger and equally spaced 
on the base. Periphery and base of the last whorl well-rounded, the latter 
narrowly umbilicated. Aperture rather large, broadly ovate, posterior angle 
acute; outer lip thin; columella slender; very strongly curved and reflected, 
not re-enforced by the base; parietal wall covered by a thin callus. Length, 
4.6; diameter, 2.5 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 159464b. Type locality, 
Captain's Harbor, Unalaska, Alaska. 
Range. Captain's Harbor to Kodiak, Alaska. 
Odostomia cassandra Bartsch, 1912 
Plate 61, fig. 2 
Proceedings of the United States National Museum, 42 :285; PI. 38, figs. 5. 
Shell small, ovate, very thin, semitransparent, light yellow. Nuclear 
whorls deeply immersed in the first of the succeeding turns. Post-nuclear 
whorls very strongly tabulately shouldered at the summit, moderately 
rounded, marked by fine incremental lines, and numerous, exceedingly 
closely spaced, very fine, spiral striations. Sutures strongly constricted. 
Periphery of the last whorl well-rounded. Base rather long, well-rounded. 
Aperture very large, broadly oval; posterior angle decidedly obtuse; outer 
lip very thin; inner lip very slender, very oblique, somewhat sinuous, 
strongly curved and slightly reflected over the base but not appressed to it, 
provided with a weak fold some little distance anterior to its insertion. 
Length, 2.5; diameter, 1.3 mm. (Bartsch.) 
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