The Collaborative International Dictionary of English v.0.48:

Proboscidifera \Pro*bos`ci*dif"e*ra\, n. pl. [NL. See
   Proboscis, and -ferous.]
   [1913 Webster]
   1. (Zool.) 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.
      [1913 Webster]

   2. (Zool.) A subdivision of the t[ae]nioglossate gastropods,
      including the fig-shells (Pyrula), the helmet shells
      (Cassis), the tritons, and allied genera.
      [1913 Webster]