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Nautilus pompilius (Linnaeus), showing the interior of the lower celi, to which the animal is fixed like a waterspout.
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Nautilus.
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Nautilus pompilius (Linnaeus), showing the lower celi and the partition giving passage to the waterspout.
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Nautilus pompilius L., in section, showing the Septa (s,s), the septal necks (s.n., s.n.), the siphuncle dotted in (si), and the large body chamber (ch).
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Shell of Nautilus pompilius (Linnaeus).
