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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| Lower taxonomic level | Main Page | Alphabetic Index | Systematic Index | Glossary |
| 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 |