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From Biology-Online Dictionary
1. (Science: zoology) 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.
2. (Science: zoology) A subdivision of the taenioglossate gastropods, including the fig-shells (pyrula), the helmet shells (Cassis), the tritons, and allied genera.
Origin: NL. See Proboscis, and -ferous.