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Cylichnidae
The family Cylichnidae  includes mostly burrowing species with well calcified shells. A spire is absent and they can withdraw completely into their shells. At least four species are known from Hawaii in three genera (Cylichna, Eocylichna and Roxania(?)).

Cylichna analogia

Cylichna biplicata

Eocylichna cf. venustula

Roxania(?) calcarea
 
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