An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms

by Paul S. Mikkelsen

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Term Definition

FREE   Refers to a shell which is not ATTACHED (e.g., to substrate); see also: VALVE, FREE.

FREE EDGE   The outer margin or OUTER APERTURAL LIP of a gastropod shell.

FREE VALVE   In attached bivalves, the valve which is not attached to the substrate; = UPPER VALVE.

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