70 NILS ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. III. OPISTHOBRANCHIA ETC. 



Issa lacera (Abildgaard 1806). 

 Habitat: 



Norway: Molköesund, Hammerfest, 15 fms (Loven) 1 sp. 

 Greenland: Posselt (1898). 



(lieneral distribution: 



Norway: Bodö — Vadsö, 30 — 100 fms, stones (G. O. Särs 1878); Ringvatsö, 

 Tromsö, 10—12 fms (Krause 1895). — N. of Norway 71° 5' N. 26" 16' 5" E., 300 m, 

 bottom temp. +3,93° C. (Friele 1902). — Murman coast (Pfeffer 1889; Herzenstein 

 1893). - Nova Scotia; Cape Gode (Whiteaves 1901). 



Issa villosa n. sp. 



Pl. 1 tig. 21. 

 Habitat: 

 Spitzbergen: Bel Sound, 16 — 20 fms (Torell) 7 sps. 



Thecacera virescens Ålder & Hancock 1855. 



Distriliiilioii: Norway: Hardaiigor ((t. 0. iSai-s 187S). — Britisli coasts (Jeffreys 18ö9). 



Palio Lessoni (d'Orbigny 1837). 



1'1. II tig. 16. 

 Habitat : 



The Baltic: Kiel (Möbius) 1 sp. and 5 sps. (P. ocellata). 



West coast of Sweden: Bohuslän, GuUmarn (Loven) 1 sp. ; D:o Löken 22 fms 

 1 sp. (Mus. G.); D:o Kristineberg 1 sp. (Mus. U.); Nötholmen, Strömstad (Febr. 1890, 

 Hanson) 1 sp. ; Dyngö? (Goés) 1 sp. 



Norway : 1 sp. (P. dubia) without definite locality (Kröyer). 



Greenland: Posselt (1898, P. Holbölli) 20 fms, rocks. 



General distribution: 



Norway: the west coast (P. dubia and ocellata); Aalesund (G. O. Särs 1878); 

 Finmarken (Loven 1846, P. pudica) ; Kvsenangen, Tromsö 15 fms (Krause 1895). — 

 Murman coast (Pfeffer 1889, P. Holbölli). - Wliite Sea (Herzenstein 1893, P. HolböIU). 

 — Greenland (Mörch 1857, P. HolböUi). — Iceland (Mörch 1868, P. ocellata). — British 

 coasts (Jeffreys 1869). — Denmark (Mörch 1871). — Kiel; Heligoland (Meyer & Mö- 

 bius 1865, P. ocellata). — Travemlinde (Lenz 1875, P. ocellata). — Heligoland (Heincke 

 1894). — France (Vayssiére 1901). — Adriatic (Carus 1889). - East Canada (White- 

 aves 1901). From tide-marks to the coraliine zone (Jeffreys 1869). 



