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Keywords: Conchological Manual Figs 75-81.png Umbones These are the prominent points of the dorsal edge where the growth of the shell commenced and are called beaks by some English writers Fig 75 distant; 76 straight; 77 curved; 78 spiral; 79 decumbent; 80 free; 81 close gutenberg A Conchological Manual 43417 1842 George Brettingham Sowerby II 1812 “1884 PD-old-100 A conchological manual 1842 Mollusca anatomy |