Molluscs : Benthic opisthobranchs (Mollusca Gastropoda) keys and notes for the identification of the species - Thompson, T. E.; Linnean Society of London; Estuarine and brackish, water sciences association (Leiden : E. J. Brill, 1988)
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Keywords: Opisthobranchia -- British Isles; Opisthobranchia -- British -- Identification; Mollusks -- Identification; Mollusks -- British Isles -- Identification