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

by Paul S. Mikkelsen

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Term Definition

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.

PERITREME   The whole circumference of the aperature of a spiral shell (in descriptions, it is said to be notched or entire, simple, reflected, round or oval, etc.; see also: PERISTOME.

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