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Pearly Nautilus.   A manual of the Mollusca  London :Virtue & Co.,1868.  Biodiversitylibrary. Biodivlibrary. BHL. Biodiversity Heritage Library

Nautilus is one of the best examples of the logarithmic spirals found in nature. Famous mathematician Jacob Bernoulli said that logarithmic spirals are a symbol of “fortitude and constancy in.