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Keywords: Conchological Manual Figs 51-54.png When the edge of a notch at the anterior extremity is expanded and drawn out in the form of a beak it is said to be canaliferous or to have a canal Canals Fig 51 Fasciolaria truncated; 52 Nassa recurved varicose; 53 Cerithium recurved; 54 Typhis closed gutenberg A Conchological Manual 43417 1842 George Brettingham Sowerby II 1812 “1884 PD-old-100 A conchological manual 1842 |