Abstract
In this paper 16 species of polychaetes new to the Icelandic fauna are reported. The species are: Pisione remota, Chaetoparia nilssoni, Phyllodoce citrina, Gyptis rosea, Leocrates atlanticus, Microphthalmus aberrans, Synelmis klatti, Amblyosyllis finmarchica, Pionosyllis lamelligera, Exogone verugera, Exogone longicirris, Glycinde nordmanni, Eunice dubitata, Drilonereis filum, Ophryotrocha baccii, Schistomeringos nigridentata. Comments are made on five other polychaete species previously known from Icelandic waters: Eulalia bilineata, Kefersteinia cirrata, Haplosyllis spongicola, Glycera rouxii, Eunice norvegica. The type material of Castalia aurantiaca and Exogone furcifera was studied and the species placed in synonymy with Kefersteinia cirrata and Exogone longicirris respectively.