dorsal tentacles
Rhinophore Rhi"no*phore, n. [Rhino- + Gr. fe`rein to bear.] (Zo["o]l.) 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]

The Collaborative International Dictionary of English. 2000.

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