198 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Odostomia movilla Dali and Bartsch, 1909 
Plate 60, fig. 1 
Bulletin 68, United States National Museum, 213; PI. 25, fig. 1. 
Shell elongate-ovate, white. Nuclear whorls deeply obliquely immersed 
in the first of the succeeding turns, above which only the tilted edge of the 
last volution projects. Post-nuclear whorls feebly rounded in the middle, 
strongly so at the sloping shouldered summit, and moderately contracted 
at the suture. Periphery weakly angulated. Base rather long, moderately 
rounded, sloping gently from the periphery to the umbilical area. Suture 
well-impressed. Entire surface of spire and base marked by fine retractive 
lines of growth and numerous, very fine, closely spaced, wavy, spiral 
striations. Aperture broadly oval, posterior angle obtuse; outer lip thin ; 
columella slender, very strongly curved, very oblique, provided with a 
deep-seated fold at its insertion; parietal wall covered with a thin callus. 
Length, 3.6; diameter, 1.7 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 206922. Type locality, 
United States Bureau of Fisheries Station 2936, in 359 fathoms, off San 
Diego, California. 
Range. Known only from type locality. 
Odostomia nemo Dali and Bartsch, 1909 
Bulletin 68, United States National Museum, 198; PI. 22, fig. 8. 
Shell elongate-conic, milk-white. Nuclear whorls deeply obliquely 
immersed in the first of the succeeding turns, above which only the tilted 
edge of the last volution projects. Post-nuclear whorls flattened in the 
middle, moderately contracted at the suture, and roundly shouldered at 
the summit. Sutures strongly impressed. Periphery and base of the last 
whorl somewhat inflated, well-rounded, the latter very frequently narrowly 
umbilicated. Entire surface of spire and base marked by vertical lines of 
growth and numerous exceedingly fine, spiral striations. Aperture ovate, 
somewhat effuse anteriorly; posterior angle acute; outer lip thin; columella 
thin, curved, strongly reflected, provided with a fold at its insertion; 
parietal wall glazed with a thin callus. Length, 4.8; diameter, 2.4 mm. 
(Dali and Bartsch.) 
Type in United States National Museum, No. 206911. Type locality, 
San Diego, California. 
Range. San Pedro to San Diego, California. 
[496] 
