Sowerby, J. 1822. The Mineral Conchology of Great Britain; or Coloured Figures and Descriptions of those Remains of Testaceous Animals or Shells, which have been preserved at various times and depths in the Earth 4: 1-160, pls. 307-407. Available electronically.
Sowerby, 1822. Mineral Conchology 4: 86, pl. 362, figs. 7-8.
Sowerby, 1822. Mineral Conchology 4: 85, pl. 362, figs. 1-3.