Aartsen, J.J. van, 1977. European Pyramidellidae: I. Chrysallida . Conchiglie, 13: 49-64. Graham, Alastair F.R.S., 1988. Molluscs: Prosobranch and Pyramidellid Gastropods. Synopses of the British fauna (NS), 2: 1-662. Seaward, D.R., 1990. Distribution of the marine molluscs of north west Europe. Nature Conservancy Council. |