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.-^; 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 (Loven 

 1846). — E. Kattegatt, 15—40 fms (Petersen 1888). Iceland (Mörch 1869'\ Verkrüzen 

 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.:! 

 (Pfeffer 1890). - Kara Sea, 4-20 fms (1. 9..-,, 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, 1. 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—640 fms (Verrill 1885). 



— 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. princepsj ; 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. 



Distribnliou : Norway: Dröbak, 50 fms (Jeffreys 1870) 3 shs. — Off Portugal. 292 fms (Jeffreys 

 1882: Nobre 1905). 



Emarginula fissura (Linne 1758). 



(= E. reticulata Sowerby 1813.) 

 PI. 2 figs. 42—45. 



Habitat: 



West coast of Sweden: KuUen (Lilljeborg 1852) 1 sh., 1. 10.2; br. 8; h. 5.2 

 (Mus. U.). — Bohuslän (Loven) several shs, max. 1. 13; br. 10.4; h. 8.5; Skar, Gull- 



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