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

by Paul S. Mikkelsen

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Term Definition

IMPERFORATE   Not open or perforated; often said of a closed UMBILICUS; see also: PERFORATE.
   

PERFORATE   Having a minute opening at the base of the shell; see also: IMPERFORATE; UMBILICATE.
   


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