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The Nuttall Encyclopedia
A genus of fossil shells curved into a spiral form like the ram-horn on the head of the image of Ammon.
Wood, James, ed. Entry for 'Ammonites (2)'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/a/ammonites-2.html. Frederick Warne & Co Ltd. London. 1900.