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 
(Lovén, type of Lovén's Margarita alabastrum BEcK)' 3 sps, max. h. 14.3; ap. 5.5; 
d. 12.2; wh. 8, Fig. 24, — Hammerfest, 100 fms, sand (Lovén) 5 sps, max. h. 12:7. 
Kola Peninsula: Waideguba, 1 mile on sea (Sandeberg ??/s 1877) 2 sps, max. 
h. 10.3; ap. 4.5; d. 9.2; wh. 7. — Subowski, 14 fms, sand (Sandeberg "/o 1877) 1 sp., 
hil6525 ap 3 difönwhetos a 
Average value of formal variation: 
Height of shell | max. 14.3 (Loppen) 
5—6 | 8-9 | N—I2 
30 sps Height of åporture | 22-055 | 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!f2 | 6/2 | 7 | 8 
General 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 (Lovén 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—560 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; W. off Treland, 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 (Jeffreys 1883). — Portugal (Nobre 1905). — Mediterranean, Marseille 445—555 m, 
and other localities to 2000 m; Aegean (Locard 1898; Carus 1889). — Madeira; Azores (Locard 1898). 
Margarita helicina (PHiPers 1774). 
Pl. 3 figs. 26—34; Pl. 6 figs. 3—5>3. 
Habitat: 
West coast of Sweden: Bohuslän (Lovén) 7 sps, max. h. 3.1; ap. 2;5d. 3.1; 
wh. 4'/2, Fig. 34; Humlesäcken, alge (THÉEL 1907). — Sydkoster, 5—15 fms (Eisen 
1 Becks's type is a Margarita cinerea Couth. according to Posselt & Jensen 1899. 
