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

by Paul S. Mikkelsen

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Term Definition

BOURRELET   Either of two portions of bivalve ligamental area flanking RESILIFER on its anterior and posterior sides, each comprises growth track and seat of the lamellar LIGAMENT. The posterior bourrelet is flattish in all oysters except the Exogyrinae, in which it is a narrow, sharp-crested spiral ridge on the left valve and a corresponding GROOVE on the RIGHT VALVE.

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