Image: Helicodiscus parallelus shell
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Description: drawing of the shell of Helicodiscus parallelus
Title: Helicodiscus parallelus shell
Credit: Dall W. H. 1905 Alaska, Volume XIII, Land and Fresh Water Mollusks. New York, Daubleday, Page & Complany, pages 1-157, page 52.
Author: W. H. Dall (1845-1927)
Permission: public domain
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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