54 NILS ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. V. PROSOBRANCHIA. 1 DIOTOCARDIA. 
General Distribution: 
Norway, Finmark southwards (d. 7; G. O. Sars 1878; Friele 1874; Schneider 
1881; 1885; 1891; 1894; Bidenkap 1897; Aurivillius 1886; Norman 1902); Korsfjord 
135—217 fms (Metzger 1875). — Bohuslän, Väderöarna, Laminarie (Malm 1855); 
Göteborg Skärgård, Vinga ränna, 1 sp. (Malm 1858). — Kattegatt, NE. of Anholt, 
dead shs (Petersen 1888). — Iceland (Mörch 1869”, Verkräzen 1872; Johansen 1902). 
— Faroes (Mörch 1868). — British Islands (Jeffreys 1865, Hargreaves 1910, + var. 
fasciata). — Jan Mayen, 10—15 fms (Friele 1878, Hägg 1905). — Norwegian Sea 
(Friele 1902). — Murman Coast, White Sea, Nova Zembla and Kara Sea (Herzenstein 
1893, Dautzenberg 1911). — Russian Lapland (Middendorff 1849). — Kara Sea, 2—20 fms 
(Leche 1878; Collin 1887). — Franz-Josef Land, 1—127 fms (Melvill & Standen 1900). — 
Spitzbergen, to 87 m (d. 8.5, Knipowitsch 1901”; 1902; Krause 1892; Friele 1879; Mörch 
1869). — Greenland, to 100 fms (Posselt & Jensen 1899). — Jones Sound, 4—26 m, max. d. 
9.2 (Grieg 1909). — Parry Islands (Sutherland 1852). — Eastern Canada (Whiteaves 
1901). — New England (d. 6, Gould & Binney 1870). — Behring Sea (Crosse 1877; 
Krause 1887); Behring Island (Dall 1885); Aleutian and Sitcha (Dall 1875). — Ochot- 
chian Sea (var. major, Middendorff 1849, 1851). — Amur, 1. 95.5 (Schrenk 1867). — 
Northern Japanese Sea (Dunker 1882). — Vancouver Island (Carpenter 1864). Depths 
to 226 m; Young sps to 386 m; dead shells to 1,203 m (Hägg 1905). Algz&e, stones, 
sand, clay. 
Margarita olivacea (BRoOwNn 1827) 
(incl. var. gigantea LEcHE). 
Pl. ,3 figs) A1—46; Pli4 figs.. 1—351 Ply6:figs 83-13. 
Habitat: 
Finmark (Lovén) 1 sp., h. 2.6; d. 3.5; sculpture moderately fine; colour light 
yellowish green. — D:o (Sparre Schneider) 3 sps, max. h. 3.5; ap. 2.2; d. 4; wh. 
41/2; aperture somewhat lower than in specimens from Spitzbergen. 
Kara Sea (LECHE 1878), max. h. 5.6; ap. 3.6; d. 6.2; wh. 4'/2; sculpture varying, 
coarser or finer. Var. gigantea; h. 9.7; ap. 6.5; d. 10.9; wh. 5, Fig. 3 to the right; 
h. 10.3; ap. 7; d. 11.2; wh. 510, Fig. 3 to the left. — Further: Jugor sharr, off 
Chabarova, 5—8 fms, clay, sand (N. Zembla Exp. ?/, 1875). 
North of Siberia and Behring Sea (AUuRrRIVILLIVS 1887): Irkaipij, Fig. 2, and 
other localities. Max. dimensions of var. gigantea (=-the type of Aurivillius), N:o 
1068: h. 6.2; ap. 4.2; d. 7; wh. 4 and h. 6; ap: 4:55; d. 7.6; wh. 4. Shell thin, light 
coloured; apex obtuse. 
Spitzbergen: Off Horn Sound, 76” 46' N., 5? 22 E., 210 m, fine blackish gray clay, 
bottom temp. + 2.s3? (""/6 1898), 12 sps, max. h. 8; ap. 5.4; d. 9 (agreeing with var. 
gigantea by the thin shell and the pointed apex, but aberrant by the more elevated 
