Chambered nautilus
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The chambered nautilus, also called the pearly nautilus, is the best-known species of nautilus. The shell, when cut away, reveals a lining of lustrous nacre and displays a nearly perfect equiangular spiral, although it is not a golden spiral. The shell exhibits countershading, being light on the bottom and dark on top. This is to help avoid predators, because when seen from above, it blends in with the darkness of the sea, and when seen from below, it blends in with the light coming from above.
The first and so far oldest known fossil of chambered nautilus, displayed at the Philippine National Museum.
1896 skiagraph (X-ray photograph) of a N. pompilius by James Green & James H. Gardiner, from Proceedings of the Malacological Society of London, Vol. II, Pl. XV, p. 178
16th-century Northern Mannerist nautilus cup
Nautilus Pompilius (band)
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Nautilus Pompilius, sometimes nicknamed Nau, was an influential Soviet, and later Russian, rock band founded in Sverdlovsk in 1982 by Vyacheslav Butusov and Dmitry Umetsky. Butusov disbanded the group in 1997, after multiple albums and several different line-ups of the band.
Nautilus Pompilius in concert, late 1980s.