HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Chambered nautilus shell. Negative image of a section through the shell of a chambered nautilus (Nautilus pompilius), showing the internal chambers. The nautilus is a marine cephalopod 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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