Mollusc shells: classification chart showing 132 varieties, with a diagram below outlining details of the three main shapes. Coloured lithograph, 1830/1860?

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Credit: Mollusc shells: classification chart showing 132 varieties, with a diagram below outlining details of the three main shapes. Coloured lithograph, 1830/1860?. Credit: Wellcome Collection. Attribution 4.0 International (CC BY 4.0)