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A collection of more than 1500 specimens of Syllidae (Annelida, Polychaeta) from sub-Arctic and Boreal regions along the coast of Norway has been studied. We report 32 species, two of them new to science, belonging to the generaSphaerosyllisClaparède, 1863 andSyllisSavigny in Lamarck, 1818, and 16 new to Norway.Sphaerosyllis tarqueisp. nov. is characterized by having long blades on its compound chaetae and the presence of glands inside the dorsal cirri.Syllis kassp. nov. was reported, figured and described by Uschakov (1955) asSyllis oerstedi(Malmgren, 1867); however, revision of the types ofChaetosyllis oerstedireveals that they are sexual stolons ofSyllis cornutaRathke, 1843; this species is characterized by the shape of the spiniger-like chaetae, which are relatively short, distally blunt, with a thin distal spine, and unidentate falcigers some of which have similar spines. We also include descriptions and figures ofParexogone longicirris(Webster & Benedict, 1887) andSyllides longocirrataØrsted, 1845. Finally we include a key of all reported species in the area.

Based on material collected during the DIVA-Artabria I project (2002 cruise) from deep areas (629-1132m) of the shelf and upper slope off the Ártabro gulf (Galicia, NW Spain), two new species of Syllidae (Annelida: Polychaeta) are described. Eurysyllis mercuryi sp. nov. is characterized by having compound chaetae with elongated blades, provided with long spines, and Syllis mercedesae sp. nov. is diagnosed by the possession of a unique combination of straight aciculae, protruding from parapodial lobes in posterior-most chaetigers, and moderately long spiniger-like chaetae in midbody provided with indistinct subdistal tooth, appearing almost unidentate. Eurysyllis mercuryi sp. nov. is the fifth species of the genus described worldwide and the second reported species in European waters after E. tuberculata Ehlers, 1864.

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