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An Illustrated and Cross-Referenced Glossary of Malacological and Conchological Terms |
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| by Paul S. Mikkelsen | |||
| 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. | |
| OPERCULUM, CONCENTRIC | See: OPERCULUM, ANNULATE. | |
| RIB, CONCENTRIC | A RIB that follows COLLABRAL LINES. See illustration: Composite Bivalve. | |
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