Turton, W. 1831. A Manual of the Land and Fresh-Water Shells of the British Islands, arranged according to the more modern systems of classification; and described from perfect specimens n the author’s cabinet: with coloured plates of every species.. 150 pp. https://www.biodiversitylibrary.org/item/84584#page/11/mode/1up.
‘Leach’ Turton, 1831. Man. Land Fresh-Water Shells Brit. Is.: 15, fig. 6.