OPERCULE.

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OPERCULE.
Plaque calcaire qui sert à beaucoup de mollusques pour fermer l'ouverture de leur coquille. Les valvules operculaires des cirripèdes sont celles qui ferment l'ouverture de la coquille.
 
OPERCULUM
A calcareous plate employed by many Mollusca to close the aperture of their shell. The opercular valves of Cirripedes are those which close the aperture of the shell.


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