HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Nautilus shell. Polished shell of a Nautilus sp. cephalopod. The nautilus is a marine mollusc related to the octopus and squid. It has a spiral shell divided into many chambers, of which the animal inhabits only the outermost. The rest are filled with gas and fluid.
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