A group of bivalve mollusks destitute of siphons, as the oyster; the asiphonate mollusks.
Its definition shares important concepts with this word: genus, small, pectinibranch, mollusks, thick.
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Littorina
A genus of small pectinibranch mollusks, having thick spiral shells, abundant between tides on nearly all rocky seacoasts. They feed on seaweeds. The common periwinkle is a well-known example. See Periwinkle.
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