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

by Paul S. Mikkelsen

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Term Definition

RIB, DIRECTIVE   A rib, forming a part of surface ornament of a shell, that lies entirely within a single plane; see also: DIRECTIVE SPIRAL.
   

RIB, DIRECTIVE   A RIB, forming part of surface ORNAMENTATION of shell, that lies entirely within a single plane.
   


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