Keywords: Conchological Manual Fig 73.png Bivalve shell Fig 73 l t lateral teeth; c t cardinal teeth; c cartilage under the ligament; l ligament; f fulcrum of the ligament gutenberg A Conchological Manual 43417 1842 George Brettingham Sowerby II 1812 “1884 PD-old-100 A conchological manual 1842 Mollusca anatomy |