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| Keywords: Conchological Manual Figs 71-72.png Measurements of a bivalve shell The length will be measured from anterior a to posterior p and the lines of growth running in the same direction will consequently be longitudinal or concentric; transverse of some authors The height will be from the umbones u to the ventral margin and lines or bands in that direction are termed radiating; longitudinal according to some authors gutenberg A Conchological Manual 43417 1842 George Brettingham Sowerby II 1812 “1884 PD-old-100 A conchological manual 1842 | ||||
