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An Illustrated and Cross-Referenced Glossary of Malacological and Conchological Terms |
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| by Paul S. Mikkelsen | |||
| 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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