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An extensive division of pectinibranchiate gastropods, including those that have a long retractile proboscis, with the mouth at the end, as the cones, whelks, tritons, and cowries. See Illust. of Gastropoda, and of Winkle.

A subdivision of the taenioglossate gastropods, including the fig-shells (Pyrula), the helmet shells (Cassis), the tritons, and allied genera.