Allostoma Beneden, 1861 (original description)
Allostoma pallidum Beneden, 1861 (original description)
Cerebratula van Beneden, 1861 accepted as Lineus Sowerby, 1805 (original description)
Cerebratula oerstedii van Beneden, 1861 accepted as Cerebratulus oerstædtii (van Beneden, 1861) accepted as Lineus bilineatus (Renier, 1804) accepted as Siphonenteron bilineatum Meneghini in Renier, 1847 (original description)
Mesostomum marmoratum Schultze, 1851 accepted as Promesostoma marmoratum (Schultze, 1851) Graff, 1882 (additional source)
Monocelis hyalina Beneden, 1861 accepted as Monotus hyalina (Beneden, 1860) (original description)
Nemertes communis van Beneden, 1861 accepted as Lineus ruber (Müller, 1774) (original description)
Nemertes flaccida accepted as Fasciola flaccida Müller, 1774 (additional source)
Nemertes quatrefagii Beneden, 1861 accepted as Lineus longissimus (Gunnerus, 1770) (original description)
Polia capitata Beneden, 1861 accepted as Tetrastemma candidum (Müller, 1774) (original description)
Polia farinosa van Beneden, 1861 accepted as Oerstedia dorsalis (Abildgaard, 1806) (original description)
Polia involuta van Beneden, 1861 accepted as Carcinonemertes carcinophila (Kölliker, 1845) (original description)
Procerodes littoralis Van Beneden, 1860 accepted as Foviella affinis (Ørsted, 1843) (original description)
Vortex balticus Schultze, 1851 accepted as Provortex balticus (Schultze, 1851) Graff, 1882 (additional source)

Belgian Coast for Allostoma pallidum Beneden, 1861 
Belgian Coast for Mesostomum marmoratum Schultze, 1851 
Belgian Coast for Monocelis agilis Schultze, 1851 
Belgian Coast for Monocelis hyalina Beneden, 1861 
Belgian Coast for Planaria littoralis Müller, 1776 
Belgian Coast for Polycelis laevigatus Quatrefage, 1846 
Belgian Coast for Pseudostomum faeroense Schmidt, 1848 
Belgian Coast for Vortex vittata Frey & Leuckart, 1847