Key:  Family Cerithiidae

Taken primarily from  Kozloff, 1987, 1996 p. 212 (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)

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1a	Without axial ribs on the body whorl and whorl above it, so the spiral ridges on these whorls are not noticeably beaded; height up to about 2.2 cm	Bittium eschrichtii
1b	With axial ribs on the body whorl, or at least on the whorl above it (as well as on the upper whorls), so that the spiral ridges are slightly to conspicuously beaded; height to about 1.2 cm	2
2a	Spiral ridges conspicuously beaded on all whorls	Bittium munitum
2b	Spiral ridges only faintly beaded	Bittium attenuatum

  Bittium eschrichtii