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[[strikethrough]] are [[strikethrough]] only four species are known, is the only survivor of the entire family. Contrary to general belief, the Nautilus does not float on the surface of the sea, but crawls along the bottom in rather deep water. The section exhibited shows the remains of the siphuncle - a tube extending from the outermost to the innermost chamber of the shell. It is now believed that the use of this tube is to maintain a living connection between the animal and all parts of its shell. [[strikethrough]] In [[strikethrough]] Formerly, the animal was