Keywords: Conchological Manual Figs 43-50.png Apertures Fig 43 Helicina semilunar; 44 Pirena pyriform; 45 Cypraea linear; 46 Trochus trigonal; 47 Cyclostoma rounded; 48 Chilina posteriorly contracted; 49 Stomatia transversely oval; 50 Murex longitudinally oval gutenberg A Conchological Manual 43417 1842 George Brettingham Sowerby II 1812 “1884 PD-old-100 A conchological manual 1842 |