British echiurids (Echiuroidea), sipunculids (Sipunculoidea) and priapulids (Priapuloidea). With keys and notes for the identification of the species: A synopsis of the Echiuroidea, Sipunculoidea and Priapuloidea of British waters
Stephen, A.C. (1960). British echiurids (Echiuroidea), sipunculids (Sipunculoidea) and priapulids (Priapuloidea). With keys and notes for the identification of the species: A synopsis of the Echiuroidea, Sipunculoidea and Priapuloidea of British waters. Synopses of the British Fauna, 12. Linnean Society of London: London. 27 pp.
Deel van: Barnes, R.S.K.; Crothers, J.H. (Ed.) Synopses of the British Fauna. Linnean Society of London: London; New York. ISSN 0082-1101, meer
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