Spirorbis spirillum (Linnaeus, 1758) accepted as Circeis spirillum (Linnaeus, 1758) (basis of record)
Syllis hyalina Grube, 1863 (additional source)

North Sea for Ammotrypane aulogaster Rathke, 1843 
North Sea for Amphitrite johnstoni Malmgren, 1866 
North Sea for Aphrodita aculeata Linnaeus, 1758  (doubtful)
North Sea for Arenicola marina (Linnaeus, 1758) 
North Sea for Capitella capitata (Fabricius, 1780) 
North Sea for Chaetopterus variopedatus (Renier, 1804) 
North Sea for Chaetozone setosa Malmgren, 1867 
North Sea for Cirratulus filiformis Keferstein, 1862 
North Sea for Dodecaceria concharum Örsted, 1843 
North Sea for Eteone lactea Claparède, 1868 
North Sea for Eulalia viridis (Linnaeus, 1767) 
North Sea for Eunoe nodosa (M. Sars, 1861) 
North Sea for Filograna implexa Berkeley, 1835 
North Sea for Flabelligera affinis M. Sars, 1829 
North Sea for Gattyana cirrhosa (Pallas, 1766) 
North Sea for Glycera alba (O.F. Müller, 1776) 
North Sea for Glycera capitata Örsted, 1842 
North Sea for Jasmineira elegans Saint-Joseph, 1894 
North Sea for Lagisca extenuata (Grube, 1840) 
North Sea for Marphysa sanguinea (Montagu, 1813) 
North Sea for Neanthes virens (M. Sars, 1835) 
North Sea for Nephtys caeca (Fabricius, 1780) 
North Sea for Nephtys ciliata (Müller, 1788) 
North Sea for Nephtys longosetosa Örsted, 1842 
North Sea for Nephtys paradoxa Malm, 1874 
North Sea for Nereis (Hediste) diversicolor O.F. Müller, 1776 
North Sea for Nereis pelagica Linnaeus, 1758 
North Sea for Nereis zonata Malmgren, 1867 
North Sea for Nicolea venustula (Montagu, 1819) 
North Sea for Notomastus latericeus Sars, 1851 
North Sea for Ophelia limacina (Rathke, 1843) 
North Sea for Owenia fusiformis Delle Chiaje, 1844 
North Sea for Pholoe minuta (Fabricius, 1780) 
North Sea for Phyllodoce (Anaitides) groenlandica Örsted, 1842 
North Sea for Phyllodoce (Anaitides) maculata (Linnaeus, 1767) 
North Sea for Phyllodoce (Anaitides) mucosa Örsted, 1843 
North Sea for Polycirrus medusa Grube, 1850 
North Sea for Polydora ciliata (Johnston, 1838) 
North Sea for Protula tubularia (Montagu, 1803) 
North Sea for Sabella pavonina Savigny, 1822 
North Sea for Scalibregma inflatum Rathke, 1843 
North Sea for Scoloplos armiger (Müller, 1776) 
North Sea for Serpula vermicularis Linnaeus, 1767 
North Sea for Spio filicornis (Müller, 1776) 
North Sea for Spiophanes bombyx (Claparède, 1870) 
North Sea for Spirorbis spirillum (Linnaeus, 1758) 
North Sea for Sthenelais boa (Johnston, 1833) 
North Sea for Syllis hyalina Grube, 1863 
North Sea for Thelepus cincinnatus (Fabricius, 1780) 
North Sea for Tomopteris helgolandica Greeff, 1879 
North Sea for Tomopteris nisseni Rosa, 1908 

 Spelling

 for Scolelepis Blainville, 1828

Various misspellings have entered the literature. Hartman catalogue reports Scolecolepis, Scolecolipis, ... [details]

 Spelling

 for Thelepus Leuckart, 1849

misspelling as Telepus [details]