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

by Paul S. Mikkelsen

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Term Definition

(pl. COSTAE)
  A round-topped sculptural element, stronger than a cord, usually formed by periodic thickening of the outer lip in gastropods. Moderately broad and prominent elevation of surface of shell, directed radially or otherwise; see also: COSTELLA.

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