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

by Paul S. Mikkelsen

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Term Definition

GROWTH LINE   A line on the shell surface indicating the position of the shell margin at an earlier stage of growth; = INCREMENTAL LINE; = CONCENTRIC LINE. See illustration: Composite Gastropod and Composite Bivalve. See also: COLLABRAL LINES.

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