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

by Paul S. Mikkelsen

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Term Definition

HYPOSTRACUM   (1) Inner layer of shell wall, secreted by entire epithelium of MANTLE (original usage of term); (2) part of shell wall secreted at attachments of ADDUCTOR MUSCLES.

MESOSTRACUM   [need definition]; (refers to some aspect of CHITONS)

MYOSTRACUM   Part of shell wall secreted at attachments of ADDUCTOR MUSCLES (of bivalves); see also: HYPOSTRACUM.

OSTRACUM   Outer part of CALCAREOUS wall of shell, secreted at mantle edge [original usage]; entire calcareous wall of shell [usage by some later authors]; see also: PERIOSTRACUM.

PERIOSTRACUM   The outermost molluscan shell layer, composed of CONCHIOLIN; = DRAP MARIN (by French naturalists); erroneously called "epidermis" by authors; see also: OSTRACUM.
Photo: Cymatium pileare (Linne, 1758)


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