Shells of clams and snails Shells of clams and snails from the Roman layers. Smooth clams - Callista chione Rough cockles - Acanthocardia tuberculata Turbans Operculum - Astraea rugosa Oysters - Ostrea edulis Bittersweet clams - Glycymeris bimaculata Warty Venus clams - Venus verrucosa Noeah's ark shell - Arca noae Bittersweet clams - Glycymeris glycymeris Mediterranean mussel - Mytilus galloprovincialis
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