226 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
riphery and base of the last whorl slightly inflated, well-rounded, marked 
like the spire. Aperture ovate; posterior angle acute; outer lip thin; 
columella slender, strongly curved, slightly revolute, re-enforced by the 
base, provided with a weak, deep-seated fold; parietal wall covered with a 
thin callus. Length, 1.7; diameter, 0.8 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 206939. Type locality, 
off Coronado Beach, San Diego, California, in 35 fathoms. 
Range. Known only from type locality. 
Odostomia dinella Dali and Bartsch, 1909 
Plate 65, fig. 1 
Bulletin 68, United States National Museum, 232; PI. 30, fig. 1. 
Shell small, ovate, vitreous, semitransparent. (Nuclear whorls decol¬ 
lated.) Post-nuclear whorls forming a spire with almost straight sides, 
slightly rounded, feebly contracted at the suture, appressed at the summit, 
marked only by lines of growth. Suture well-impressed. Periphery of 
the last whorl obscurely angulated. Base somewhat inflated, well-rounded, 
narrowly umbilicated, marked like the spire. Aperture ovate, posterior 
angle acute; outer lip thin; columella slender, almost vertical, slightly 
revolute, provided with a weak fold at its insertion; parietal wall covered 
with a strong callus. Length, 2.2; diameter, 1.2 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 206938. Type locality, 
off Redondo, California. 
Range. Known only from type locality. 
Odostomia farella Dali and Bartsch, 1909 
Plate 65, fig. 4 
Bulletin 68, United States National Museum, 232; PI. 30, fig. 4. 
Shell small, white. (Nuclear whorls decollated.) Post-nuclear whorls 
flattened in the middle, slightly rounded at the appressed summit, strongly 
contracted at the suture, where they are decidedly overhanging. Periphery 
angulated. Base well-rounded, narrowly umbilicated. Entire surface of 
spire and base marked by fine lines of growth only. Aperture ovate, pos¬ 
terior angle acute; outer lip thin; columella very obliquely posteriorly, 
decidedly curved anteriorly, strongly reflected, provided with a weak fold 
somewhat anterior to its insertion; parietal wall covered with a thin callus. 
Length, 2.5; diameter, 1.2 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 206937. Type locality, 
off Long Beach, California. 
Range. Known only from type locality. 
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