Literature
- Poppe, G.T. & Y. Goto 1991. European Seashells. Vol. I. 352 pp. Wiesbaden/Verlag Christa Hemmen.
- Seaward, D.R. 1990. Distribution of the marine molluscs of north west Europe. Nature Conservancy Council.
- Thompson, T.E. & G.H. Brown 1976. British Opisthobranch Molluscs (Mollusca: Gastropoda). Synopses of the British Fauna (NS), 8: 1-203.
- Thompson, T.E. 1988. Molluscs: Benthic Opisthobranchs (Mollusca: Gastropoda). Synopses of the British fauna (NS), 8: 1-356.