Keywords: Conchological Manual Figs 33-37.png Whorls of non-symmetrical Univalves Fig 33 few; 34 numerous; 35 rounded ventricose; 36 angular ventricose; 37 flattened gutenberg A Conchological Manual 43417 1842 George Brettingham Sowerby II 1812 “1884 PD-old-100 A conchological manual 1842 |