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Keywords: Conchological Manual Fig 24.png Fig 24 Measurement of spiral non-symmetrical univalves The length is measured from the apex to that part of the aperture a fig 24 at the greatest distance from it The breadth is in the opposite direction The anterior or front part of the aperture is marked a where the head of the animal protrudes gutenberg A Conchological Manual 43417 1842 George Brettingham Sowerby II 1812 “1884 PD-old-100 A conchological manual 1842 |