Mollusk considered a living fossil (8)

I believe the answer is:

nautilus

(Other definitions for nautilus that I've seen before include "Captain Nemo's submarine" , "Spiral-shelled mollusc" , "Usual tin for a small sea creature" , "Nemo's vessel" , "Sea creature to be found in the usual tin, unusually" .)

I've seen this clue in the LA Times.

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