40 NILS ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. V. PROSOBRANCHIA. 1 DIOTOCARDIA. 
the growth proceeds in different ways: in Spitzbergen the proportions of the shell 
are not subject to any great change, but in southern waters the height increases in 
irregular proportion to the length and breadth; thus the large specimens here are 
always more depressed, while in Arctic districts they are more elevated. Besides 
this, the southern specimens attain a greater length than the Arctic ones, so that the 
maximum size of the species is to be found in the boreal region. Specimens from 
Finmark show a perfect agreement with the elevated arctic forms. The last-named 
gives evidence of a striking uniformity of variation in the different districts. 
General Distribution: 
Norway: Finmark southwards, 10—250 fms (1. 9, G. O. Sars 1878; Friele 
1874; Schneider 1881; 1885, 1. 9.5; 1895; Aurivillius 1886; Norman 1902; Nordgaard 
1907; Lilljeborg 1851; Metzger 1875). — Christianiafjord, 10—60 fms (Asbjörnsen 1854; 
Jeffreys 1870). — Väderöarna, 60—120 fms (Malm 1855); Bohuslän to Finmark (Lovén 
1846). — E. Kattegatt, 15—40 fms (Petersen 1888). Iceland (Mörch 1869"; Verkriäzen 
1872). — Faroes (Mörch 1868). — N. of Hebrides, 570 fms (Jeffreys 1883"). — British 
Islands (Jeffreys 1865). — Dogger Bank, 30 fms (Hargreaves 1910). — North Sea, 
coast of Holland—--Belgium (Maitland 1897). — France, 585 to 2020 m (Locard 1899; 
Reynell 1909). — Cape Finisterre, 2018 m (Locard 1898). — Off Portugal, 292—1095 
fms (Jeffreys 1882; Nobre 1905). — Jan Mayen, 263 fms (Friele 1878). — Murman 
Coast, White Sea, Nova Zembla (Herzenstein 1893). — Murman Coast, 1. 10.4; h. 7.3 
(Pfeffer 1890). — Kara Sea, 4—20 fms (1. 9.5, Leche 1878). — Spitzbergen, 146—410 
fms (Friele 1879; Mörch 1869; Knipowitsch 1901). — Franz-Josef Land, 53—93 fms 
(Melvill & Standen 1900). — E. Greenland (Hägg 1905). — W. Greenland, 4—100 fms 
(Posselt & Jensen 1899). — Jones Sound, 69 m, l. 7 (Grieg 1909). — Wellington 
Channel (Reeve 1855; Cemoria cognata). -— E. Canada, 10—50 fms (Whiteaves 1901). 
— New England to Cape Cod, 1. 5 (Gould & Binney 1870); 16—0640 fms (Verrill 18835). 
Behring Sea (Krause 1885). — Ochotchian Sea and Japan (Jeffreys 1876). — Van- 
couver, Puget Sound; Oregon, var. galeata (Carpenter 1857, 1864). — Marion and 
Prince Edward Island, 60—310 fms (var. princeps); Magellan Sound (var. galeata : 
Watson 1886). — Patagonia (Strebel 1907). — Falkland Island, 4—30 fms (Strebel 
1907, 1908). Depths to 1095 fms. Clay. 
Fissurisepta granulosa JEFFREYS 1882. 
Distribution: Norway: Dröbak, 50 fms (Jeffreys 1870) 3 shs. — Off Portugal, 292 fms (Jeffreys 
1882; Nobre 1905). 
Emarginula fissura (LINNÉ 1758). 
(=E, reticulata SowerBy 1813.) 
Pl. 2 figs. 42—45. 
Habitat: 
West coast of Sweden: Kullen (LTILLJEBORG 1852) 1 sh., 1. 10.2; br. 8; h. 5.2 
(Mus. U.). — Bohuslän (Lovén) several shs, max. 1. 13; br. 10.4; h. 8.5; Skår, Gull- 
