Keywords: Conchological Manual Figs 17-20.png Fig 17 to 20 Cup and Saucer Limpets The form from which the group derives its generic appellation is that of the cup-shaped or Cyathiform species fig 17 In the Crepidulae or Slipper-Limpets the septum is flat reaching across the opening like the deck of a vessel; it is then described as transverse fig 20 In Calyptraea Equestris it has two prominent points and is described as bi-furcated fig 18 In another species it is a three-sided plate rather spiral at the apex fig 19 gutenberg A Conchological Manual 43417 1842 George Brettingham Sowerby II 1812 “1884 PD-old-100 A conchological manual 1842 |