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The nautilus shell presents one of the finest natural examples of a logarithmic spiral, although it is not a golden spiral. The use of nautilus shells in art and literature is covered at nautilus shell .
Nautilus shells were popular items in the Renaissance cabinet of curiosities and were often mounted by goldsmiths on a thin stem to make extravagant nautilus shell cups, such as the Burghley Nef, mainly intended for display, or for ceremonial drinking, rather than for regular use. Small natural history collections were common in mid-19th ...
Many biological structures including the shells of mollusks. [14] In these cases, the reason may be construction from expanding similar shapes, as is the case for polygonal figures. Logarithmic spiral beaches can form as the result of wave refraction and diffraction by the coast. Half Moon Bay (California) is an example of such a type of beach ...
An unusual feature of Allonautilus scrobiculatus is its periostracum or "shell skin". The "shaggy" periostracumon is present on freshly caught samples, and is thickly interlayered, resembling slimy hair. [2] Allonautilus scrobiculatus, or otherwise known as the crusty nautilus or fuzzy nautilus is a species of cephalopod.
For example, in the nautilus, a cephalopod mollusc, each chamber of its shell is an approximate copy of the next one, scaled by a constant factor and arranged in a logarithmic spiral. [51] Given a modern understanding of fractals, a growth spiral can be seen as a special case of self-similarity. [52]
These rocks are usually accumulated at great depths. The modern Nautilus lacks any calcitic plate for closing its shell, and only one extinct nautiloid genus is known to have borne anything similar. Nautilus does, however, have a leathery head shield (the hood) which it uses to cover the opening when it retreats inside.
Allonautilus perforatus, also known as the Bali chambered nautilus, is a species of nautilus native to the waters around Bali, Indonesia. It is known only from drifted shells and, as such, is the least studied of the six recognized nautilus species. Thus, not much is known about it outside of the shell.
Wikipedia: GLAM/Natural History Museum and Science Museum/NHM Galleries/Treasures/Hans Sloane’s nautilus shell