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

by Paul S. Mikkelsen

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Term Definition

LONGITUDINAL   Direction of the longest diameter; in snails, spoken of as AXIAL (as in axial ribs); in bivalves, the direction parallel to that of the cardinal axis; see also: CONCENTRIC.

RIB, LONGITUDINAL   [need definition]. See illustration: Composite Gastropod.

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