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

by Paul S. Mikkelsen

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Term Definition

CONCENTRIC   Having a common center, as circles. In gastropod shells, said of structures roughly parallel to growth lines (referred to as LONGITUDINAL by some authors); see also: ANNULATE; TRANSVERSE. The term COMMARGINAL is preferred by some modern authors. See also: ECCENTRIC.

CONCENTRIC LINE   See: GROWTH LINE. See illustration: Composite Bivalve.

CONCENTRIC SCULPTURE   [need definition]; see also: AXIAL SCULPTURE.


RIB, CONCENTRIC   A RIB that follows COLLABRAL LINES. See illustration: Composite Bivalve.

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