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curiosity number 021
Claudio Fanelli (photo Angela Pierullo & Claudio Fanelli)
Dress of the shells
    The periostracum is an outer layer of the shell of shellfish. It consists of a protein: the conchiolin and can be thick or thin, sometimes missing altogether. It has a silky appearance.
In the picture a Cymatium partenopaeun with and without periostracum.