| Faerlea fragilis Westblad, 1945 | 1942 | 160 m | | no type location specified, Westblad notation ?Skagerrak? |
| Childia cycloposthium (Westblad, 1942) | prior 1975 | 160 m | | |
| Polycystis crocea (Fabricius, 1826) | 1913 or earlier | | | |
| Notomonoophorum coecum Luther, 1948 | 1956 or earlier | | sand clay | |
| Paromalostomum dubium (de Beauchamp, 1927) | Jul 1965 | | fine sand | from Körviken, material from W. Sterrer. |
| Proxenetes rosaceus Graff, 1882 | prior to 1956 | | | |
| Euxinia baltica Meixner, 1938 | prior to 1993 | | | Live specimens and six serially section specimens from the North Sea, Bergen area, Håkonsund; Skagerrak, Kristineberg area, Kvarnik. Leg. Karling |
| Utelga heinckei (Attems, 1897) | Aug 4, 1940 | | | Skagerak near Kristineberg. Found by Westblad. |
| Seritia elegans (Westblad, 1953) | 1925 or earlier | | | from Stichopus tremulous (Stichopodidae). |