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

by Paul S. Mikkelsen

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Term Definition

PILLAR   The part of the body whorl of the gastropod shell adjacent to the COLUMELLAR LIP; also, sometimes, the columella. In bivalves, an inward extension of outer shell layer extending longitudinally up the lower valve in HIPPURITIDS; see also: PSEUDOPILLAR.

PSEUDOPILLAR   Low, broad, inward projection of shell wall (present in some RADIOLITIDS); see also: PILLAR.

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