| Convoluta lacazii Graff, 1891 | 1892 or earlier |  |  |  | 
| Convoluta convoluta (Abildgaard, 1806) | prior to 1905 | littoral |  |  | 
| Convoluta schultzii Schmidt, 1852 | 1879 or earlier |  |  |  | 
| Collastoma monorchis Dörler, 1900 | pre 1900 |  | from gut of Phascolosoma vulgare Dies., sent by L. Cuenot |  | 
| Syndesmis echinorum Francois, 1886 | 1913 or earlier |  |  | in sea urchins [Strongylocentrotus droebachensis (Müll.), S. lividus Brdt., Sphaerechinus granularis A.Ag., Echinus sphaera Müll., E. acutus Lam.] | 
| Proxenetes flabellifer Jensen, 1878 | 1913 or earlier |  |  | beach water. | 
| Proxenetes cochlear cochlear Graff, 1913 | 1913 or earlier |  |  |  | 
| Promesostoma marmoratum (Schultze, 1851) | 1913 or earlier |  |  | very active, in marine and brackish water. | 
| Promesostoma marmoratum marmoratum (Schultze, 1851) | 1913 or earlier |  |  | very active, in marine and brackish water. | 
| Polycystis crocea (Fabricius, 1826) | 1913 or earlier |  |  |  | 
| Polycystis mamertina (Graff, 1874) | 1913 or earlier |  |  |  | 
| Plagiostomum girardi (Schmidt, 1857) | 1913 or earlier |  |  | slow acting and swimming, in waste water and aquariums. | 
| Plagiostomum ochroleucum Graff, 1882 | 1913 or earlier |  |  |  | 
| Monoophorum striatum (Graff, 1878) | 1913 or earlier | 0-28 m |  | among Ulven, Bryozoans. | 
| Monocelis fusca Örsted, 1843 | 1913 or earlier |  |  |  | 
| Monocelis lineata (Müller, 1773) | 1913 or earlier |  |  |  | 
| Genostoma inopinatum Hyra, 1993 |  |  |  | living under the carapace of Nebalia bipes collected at Roscoff, France. | 
| Beauchampiola oculifera (de Beauchamp, 1927) | 1951 |  |  | Ehlers notes a letter by Beauchamp to [Luther?] that Beauchamp found this species in small numbers in the tidal zone among algae. | 
| Carcharodorhynchus polyorchis L'Hardy, 1963 | 1961 |  | sand | la Roche Danic, Roscoff region (North-Finistere), France. | 
| Carcharodorhynchus polyorchis L'Hardy, 1963 | 1961 |  |  | dans le Chenal de l'Ile Verte, Roscoff region (North-Finistere), France. | 
| Schizochilus choriurus caecus L'Hardy, 1963 | 1961 |  | sand | sable de la Roche Danic a 30 ou 40 cm de profondeur, abondant au niveau moyen des basses mers de vives-eaux, Roscoff region (North-Finistere), France. | 
| Schizorhynchoides canaliculatus L'Hardy, 1963 | 1961 |  |  | Roche Danic et Banc du Loup, Niveau moyen des basses mers de vives-eaux, Roscoff region (North-Finistere), France. | 
| Schizorhynchoides aculeatus L'Hardy, 1963 | 1961 |  | sand | sable de la roche Danic a 50 cm de profondeur.   Niveau moyen des basses mers de vives-eaux, Roscoff region (North-Finistere), France. | 
| Schizorhynchoides macrostylus L'Hardy, 1963 | 1961 | 2-10 m | sand | sables de Duslen (profondeur 2 m) et de la Basse-Plate (profondeur: 10 m), Roscoff region (North-Finistere), France. | 
| Proschizorhynchus anophthalmus L'Hardy, 1965 | 1965 or earlier |  | coarse sand | Pointe des Jacobins near Roscoff (Nord-Finistere).  In the channel. | 
| Proschizorhynchus pectinatus L'Hardy, 1965 | 1964 or earlier |  | fine sand | Pointe des Jacobins near Roscoff (Nord-Finistere). | 
| Proschizorhynchus pectinatus L'Hardy, 1965 | 1965 or earlier |  | shelly sand | Gaurec, Aber de Roscoff.  low tide. | 
| Proschizorhynchus pectinatus L'Hardy, 1965 | 1965 or earlier |  | fine sand | Banc du Loup, near Roscoff. | 
| Proschizorhynchus pectinatus L'Hardy, 1965 | 1965 or earlier |  | coarse sand | Perroc'h, near Roscoff. | 
| Proschizorhynchus helgolandicus Karling & L'Hardy, 1965 | 1965 or earlier |  | fine sand | Perharidy, pres de Roscoff (Nord-Finistere). | 
| Proschizorhynchus echinulatus L'Hardy, 1965 | 1965 or earlier |  | coarse sand | Banc du Loup, pres de Roscoff (Nord-Finistere): gravier et sable heterogene a 50 cm de profondeur, niveaux des basses mers de vives eaux. | 
| Karkinorhynchus megalopharynx L'Hardy, 1966 | 1965 or earlier |  | coarse sand | littoral sands in the Roscoff region (North-Finistere, France).  Il a ete recolte dans differentes locatlites de la Baie de Sieck, a la Pointe des Jacobins et dans le Chenal de l'Ile de Batz (Peroc'h). | 
| Prognathorhynchus typhlus L'Hardy, 1964 | 1964 or earlier |  | fine sand | small beach north of l'Ile Verte (Chenal de l'Ile de Batz), near Roscoff (North-Finistere). | 
| Drepanorhynchides diodontus L'Hardy, 1966 | 1966 or earlier |  |  | sables marins de la région de Roscoff, Nord-Finistere, France. | 
| Ancistrorhynchus ischnurus L'Hardy, 1963 | 1963 or earlier |  |  | récolté dans des sables littoraux de la région de Roscoff (Finistere). | 
| Aphanostoma diversicolor Ørsted, 1845 | 1905 or earlier |  |  | Kanal La Manche (Plymouth, Roscoff) | 
| Rogneda palula Brunet, 1969 | Jun 2, 2007 |  | coarse sand | very coarse sand from between rocks in the Fucus serratus zone in the ‘Green Island Channel’ | 
| Rogneda palula Brunet, 1969 | Jun 6, 2007 |  | coarse sand | coarse sand from a tide pool in front of the marine station, near to the long jetty. | 
| Syndesmis echinorum Francois, 1886 | 1951 or earlier |  |  | from Paracentrotus lividus (Strongylocentrotidae). |