Mucronalia, foot reduced, but still operculate, eyes present, animal fixed by its very long proboscis which is deeply buried in the tissues of an Echinoderm, no pseudopallium. [Please select]
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[Footnote AU: In the Calcutta tanks operculate molluscs such as _Vivipara_ are certainly more free from visible attack than non-operculate species. [Please select]
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If it has been starved for several days in an aquarium it will attack an operculate form, but rarely with success. [Please select]
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