50 NILS ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. V. PROSOBRANCHIA. 1 DIOTOCARDIA. 



max. h. 12.1; d. 11.4. — Kjosen (G. & M. 1861) 2 sps, max. h. 10.7. — Loppen 

 (Loven, type of Loven's Margarita alabastrum Beck)^ 3 sps, max. h. 14.:;; ap. 5.5; 

 d. 12. '2 ; wli. 8, Fig. 24, — Hammerfest, 100 fms, sand (Loven) 5 sps, max. h, 12.7. 



Kola Peninsula: Waideguba, 1 mile on sea (Sandeberg 1877) 2 sps, max. 

 h. 10.3; ap. 4.5; d. 9.2; wh. 7. — Subowski, 14 fms, sand (Sandeberg 1877) 1 sp., 

 h. 6.2; ap, 3; d. 5.5; wh. 



Average value of formal variation: 



Heiglit of shell 



5—6 



8-9 



11—12 



max. 14.3 (Loppen) 



30 sps Height of aperture 



2.2—2.5 



3.2—3.8 



4.5—5 



5.5 



measured Diameter of shell 



4.5-5.5 



7.2—8 



9.7—10.6 



12.2 



Whorls 



5'/2 



6Va 



7 



8 



Oeiieral Distribution: 



Norway: Vadsö and Vardö, southwards, 30 — 150 fms (h. 16, G. O. Sars 1878; 

 Schneider 1881, 1885, 1894; Aurivillius 1886; De Guerne 1886); Bog Fiord, E. Fin- 

 mark, 20 — 30 fms (Norman 1902); Nordland (Krause 1887); Drontheim (M' Andrew 

 1856); Bergen (Loven 1846; Friele 1874). — Murman coast (Herzenstein 1893). — 

 Faroes, 10—30 fms (Jeffreys 1869; Mörch 1869"). -- Between Hebrides and 

 Faroes, 170-189 fms; The Minch 45—60 fms; Faroes 114 fms; Shetland, 75 fms; W. 

 off Ireland, 90—164 fms (Jeffreys 1869, 1883). - N. of Hebrides and Shetland— 

 Faire Isles, 97- — 1000 m (Simpson 1910). — Scarborough and Dogger Bank, 20—40 

 fms (Hargreaves 1910). - E. Canada, 25—40 fms (Whiteaves 1901). — New Eng- 

 land, rare, h. 13 (Gould & Binney 1870). — E. Coast of N. America 207—630 fms 

 (Verrill 1885). Depths 15 fms to 1000 m. Sand, gravel. 



Craspedotus otavianus (Cantraine 1835). 



Distribution: Norway, west coast, Bergen, 20 — 30 fms, 1 sp. (Friele 1874); 80 — 100 fms (G. 0. Sars 

 1878). — Between Hebrides and Faroe Isles, 229 fms; ^V. off Ireland, 173 fms; Lighting Exp. 1868, st. 89 

 (Jeffreys 1883). — North Sea (Locard 1904). — N. of Spain, 411 m (Locard 1898). — Off Portugal and 

 Morocco, 72—386 fms (Jeft'reys 1883). — Portugal (Nobre 1905). — Mediterranean, Marseille 445—555 m, 

 and otiier localities to 2000 ni; Aegean (Locard 1898; Carus 1889). — Madeira; Azores (Locard 1898). 



Margarita helicina (Phipps 1774). 



PI. 3 figs. 26 — 34; PI. 6 figs 3—5. 

 Habitat: 



West coast of Sweden: Bohuslän (Loven) 7 sps, max. h. 3.i; ap. 2; d. 3.7; 

 wh. 4V2, Fig. 34; Humlesäcken, algse (Theel 1907). — Sydkoster, 5—15 fms (Eisen 

 ^ Becks's type is a Margarita cinerea Couth, according to Posselt & Jensen 1899. 



