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This may possibly be a variety of the polymorphous O. edulls, owing its peculiar shape and comparative absence of lamination to its remaining attached to corals and other cylindrical substances.I think O. rosacea~ Deshayes, ought to be united with O. cochlear, as it differs only in having a brighter eolour.Pecten olaercularls ~ L.
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Jeffreys et al. (1875) studied this question.
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