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

by Paul S. Mikkelsen

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Term Definition

LOGARITHMIC SPIRAL   The kind of spiral exemplified by the shell WHORLS of the chambered nautilus; the kind of spiral formed by the rolling up of a cone, as distinct from one formed by the rolling up of a coil of rope; see also: COILING.

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