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

by Paul S. Mikkelsen

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Term Definition

PERISTOME   Edge of the aperture on a gastropod shell, including the inner and outer lips. See illustration: Composite Gastropod. See also: HOLOSTOMATE; LABIUM; LABRUM; PERITREME; SIPHONOSTOMATE.

PERISTOME, PERITREME   The margin of the APERTURE; generally said of a margin that is either continuous or interrupted only by the parietal region of the body whorl; see also: HOLOSTOMATE; SIPHONOSTOMATE.

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