An Illustrated and Cross-Referenced Glossary of Malacological and Conchological Terms |
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by Paul S. Mikkelsen |
Term | Definition |
SPIRE, SUNKEN | The condition of having the POSTNUCLEAR WHORLS higher than the spire, or NUCLEAR WHORLS (the nuclear whorls are not hidden from view, as with an involute spire); see also: SPIRE, INVOLUTE. | |
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