Keywords: Conchological Manual Figs 84-85.png Fig 84 85 Chiton a anterior; p posterior; d dorsal ridge; l l lateral areas of the valves; c c central areas; i i inserted lamina; m margin gutenberg A Conchological Manual 43417 1842 George Brettingham Sowerby II 1812 “1884 PD-old-100 A conchological manual 1842 Chitonidae |