CLASS GASTROPODA 
225 
the umbilical chink. Parietal wall covered by a thick callus. Length, 8.7; 
diameter, 4.2 mm. (Bartsch.) 
Type in United States National Museum, No. 334490. Type locality, 
San Juan Island, Puget Sound. 
Range. Known only from type locality. 
Subgenus Heida Dali and Bartsch, 1904 
Odostomia kelseyi Bartsch, 1912 
Proceedings of the United States National Museum, 42:288; Pi. 38, figs. 6, 6a. 
Shell small, ovate, bluish-white. Nuclear whorls small, obliquely im¬ 
mersed in the first of the succeeding turns, above which only the tilted 
edge of the last volution projects. Post-nuclear whorls moderately 
rounded, narrowly shouldered at the summit, marked only by moderately 
retractive lines of growth and numerous exceedingly fine, spiral striations. 
Sutures subchanneled. Periphery of the last whorl somewhat inflated, 
well-rounded. Base moderately long, sloping evenly from the periphery 
to the anterior extremity, the area about the umbilicus having a pinched-in 
effect, and is surrounded by a somewhat tumid area. Aperture large, 
broadly oval, somewhat flaring at the anterior lateral angle; posterior 
angle acute; outer lip thin; inner lip decidedly curved and slightly revo¬ 
lute; parietal wall covered with a thick callus, which joins the callus of 
the columella to the posterior angle of the aperture, rendering the peri- 
treme complete. No fold is visible on the columella. Operculum horny, 
thin, paucispiral, concavo-convex, the convex side being the outer. Length, 
2.7; diameter, 1.5 mm. (Bartsch.) 
Type in United States National Museum, No. 211544. Type locality, 
San Diego, California. 
Range. Known only from type locality. 
Subgenus Odostomia s.s. 
Odostomia coronadoensis Dali and Bartsch, 1909 
Plate 65, fig. 3 
Bulletin 68, United States National Museum, 233; PI. 30, fig. 3. 
Shell minute, ovate, vitreous. Nuclear whorls almost vertically deeply 
immersed in the first of the succeeding turns, above which the tilted edge 
of the last volution projects. Post-nuclear whorls well-rounded, slightly 
contracted at the sutures, with a well-rounded shoulder at the summit, 
marked by retractive lines of growth only. Suture well-impressed. Pe- 
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