BIOTIC References
172Graham, A., 1988. Molluscs: prosobranchs and pyramellid gastropods (2nd ed.). Synopses of the British Fauna (New Series) (ed. D.M. Kermack & R.S.K. Barnes), The Linnean Society of London. Leiden: E.J. Brill/Dr W. Backhuys. [Synopses of the British Fauna No. 2]
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