Acrorhynchides styliferus sp.n. from Norway and the British Isles and Polycystis contorta sp.n. and Typhlopolycystis coomansi sp.n. from Norway and the Mediterranean are described. Additional notes are given on the anatomy and distribution of Paracrorhynchus bergensis Karling, Polycystis groenlandica (Levinsen), P. crocea (Fabricius) and Typhlopolycystis mediterranea Brunet. The taxonomy of the species and the corresponding genera is discussed.
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Schockaert et al. (1975) studied this question.
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