Rhinophore

[Sarah]

One of the two tentacle-like organs on the back of the head orneck of a nudibranch or tectibranch mollusk. They are usuallyretractile, and often transversely furrowed or plicate, and areregarded as olfactory organs. Called also dorsal tentacles. SeeIllust. under Pygobranchia, and Opisthobranchia.