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Keywords: Conchological Manual Figs 21-23.png Fig 21 to 23 Measurement of Cup and Saucer Limpets The line marked l indicates the direction in which the shell is to be measured for length a indicates the anterior p the posterior The line d fig 23 from the apex to the base is the depth The line b fig 28 is in the direction of the breadth gutenberg A Conchological Manual 43417 1842 George Brettingham Sowerby II 1812 “1884 PD-old-100 A conchological manual 1842 |