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

by Paul S. Mikkelsen

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Term Definition

ANNULATE   Bearing more or less concentric rings, as on the inner surface of a gastropod operculum; see: OPERCULUM, ANNULATE.

OPERCULUM, ANNULATE   An OPERCULUM with a central nucleus, or nearly so, with other layers surrounding it in flattened rings. See also: MULTISPIRAL.

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