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

by Paul S. Mikkelsen

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Term Definition

INVOLUTE   Having the last whorl enveloping earlier ones, so that the height of the APERTURE is generally the height of the shell, as in the Bullidae; see also: CONVOLUTE. See other gastropod shapes.

SPIRE, INVOLUTE   The condition of having the POSTNUCLEAR WHORLS higher than, and enveloped by the NUCLEAR WHORLS; see also: SPIRE, SUNKEN.

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