dorsal tentacles

from The Collaborative International Dictionary of English v.0.48
Rhinophore \Rhi"no*phore\, n. [Rhino- + Gr. fe`rein to bear.]
   (Zool.)
   One of the two tentacle-like organs on the back of the head
   or neck of a nudibranch or tectibranch mollusk. They are
   usually retractile, and often transversely furrowed or
   plicate, and are regarded as olfactory organs. Called also
   {dorsal tentacles}. See Illust. under {Pygobranchia}, and
   {Opisthobranchia}.
   [1913 Webster]
    

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