222 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Aperture obliquely ovate; posterior angle obtuse; outer lip thin; inner lip 
very obliquely retractively slanting, somewhat flexuose and provided with 
a strong fold at its insertion; parietal wall covered by a thin callus. 
Length, 7.2; diameter, 3.5 mm. (Bartsch.) 
Type in United States National Museum, No. 334491. Type locality, 
near San Juan Island, Puget Sound. 
Range. Gulf of Georgia. 
Odostomia satura Carpenter, 1865 
Annals and Magazine of Natural History, series 3, 15 :29. Bulletin 68, United States 
National Museum; PI. 27, fig. 1. 
O. testa magna, alba, laevi, solidiore, satis elevata; anfr. nucl. ii., 
angustis, subplanorboideis, valde decliviter sitis, dextrorsum immersis, 
sinistrosum extantibus; norm, v., tumidjoribus, regulariter convexis, 
suturis impressis; basi rotundata, tumente, quasi umbilicata; apertura 
ovata; labro vix sinuato; labio tenui, appresso; plica columellari valida, 
subantica, parieti haud contigua, transversa. Long., .26; long, spir., .14; 
lat., .13 poll. (Carpenter.) 
Shell of moderate size, broadly conic, white. Nuclear whorls at least 
two, forming a depressed spire, the axis of which is almost at right angles 
to the axis of the later whorls, and which is deeply, somewhat obliquely 
immersed in the first post-nuclear turn. Post-nuclear whorls moderately 
well-rounded, faintly shouldered at the summit, marked all over by 
irregular, rough, low, tumescenses, which simulate obsolete vertical ribs. 
Sutures simple, well-marked. Periphery of the last whorl well-rounded. 
Base quite short, decidedly rounded, and umbilicated. Umbilicus partly 
covered by the revolute columella. Aperture large, very broadly oval, 
somewhat effuse anteriorly; posterior angle obtuse; outer lip thick; 
columella moderately strong, oblique, decidedly curved, with a decided 
oblique fold, situated considerably anterior to its insertion; parietal wall 
covered by a fairly thick callus. (Bartsch.) 
Type in United States National Museum, No. 15520. Type locality, 
Neah Bay, Washington. 
Range. Known only from type locality. 
Odostomia sillana Dali and Bartsch, 1909 
Plate 64, fig. 9 
Bulletin 68, United States National Museum, 222; PI. 28, fig. 9. 
Shell short, conic, yellowish-white. (Nuclear whorls eroded.) Post- 
nuclear whorls well-rounded, slightly overhanging. Summits appressed. 
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