62 NILS ODHNER, NORTHERN AND ARCTIC INVERTBBRATES. III. OPISTHOBRANCHIA ETC. 



Pleurobranchus plumula (Montagu 1803). 

 HiiUitat; 



West coast of Sweden: Bohuslän, Kosterrännan (June 1893, Ekman) 1 sp. 



General (listrilmtioii : 



Norway: The west coast 100—150 fms (G. O. Särs 1878); Nordfjord near Ma- 

 trog, 60 fms (Grieg 1897). — British coasts (Forbes & Hanley 1853; Jeffreys 1867). 



— France (Vayssiére 1901). — Mediterranean and Adriatic (Carus 1889). — Portugal 

 (Nobre 1905). - Madeira (Watson 1897). — Azores (Bergh 1899). — Lower California 

 (Bergli 1894). Depths to 150 fms. Stones, algse. 



Tylodina Duebenii Loven 1846. 

 Hahitiit : 



Norway: Bergensfjord (Koren) 1 sp., 200 fms G. O. Särs 1868. 



(lieiieral distribution: 

 Denmark: Hellebeek (Petersen 1889). 



Colpodaspis pusilla M. Särs 1870. 



l)istril)Htioii: Norway; Drobak; Hoiteii; 14 — MO fms (M. !Sai's LS70). — Plymuutli, Eiiylaiid (Liarstaiig 1894). 



Colobocephalus costellatus M. Särs 1870. 



JMstribufioii: Norway: Drobak; Yallö: 70-230 fms (M. Särs 1870). 



Tritonia Hombergi Cuvier 1802 

 (incl. var. alba Ålder & Hancock 1855). 



n. II lis. 1.^; l'l. III fig. 4. 



Habitat : 



West coast of S^\'eden: Skäiie between Väderön and Höghalla udde, 10 fms, 

 algse (^Vt 1902, Lönnberg) 1 sp. — Vinga, Göteborg Skärgård, sand, 1 sp. (Mus. G.). 



— Bohuslän: ')Gidlmarn, numerous sps. (incl. var. alba); D:o 50 m, many young 

 sps. ; D:o N. of Flatholmen 18—27 m, algte, 5 sps.; D:o Löken 22 fms, 3 sps. (Mus. 

 G.); ') Väderöarna (1881 and 1882) 3 sps.; ^) Lindö, near Kosterrännan, 30 fms 

 (Olsson) 2 sps.; ') Strömstad (1882, Hanson) 1 sp. ; ') Dyngö, Fjällbacka 1 sp. 



England: CuUercoats (Ålder) 1 sp. (var. alba). 

 Reef of Jutland 50—150 fms (1874) 1 sp. 



