28 NILS ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. V. PROSOBRANCHIA. 1 DIOTOCARDIA. 
General Distribution: 
Norway: Tromsö to Vadsö, 10—14 fms (Il. 6, G. O. Sars 1878; Lovén 1846; 
Schneider 1885; Norman 1902); Varangerfjord, 20—30 m (De Guerne 1886). — Mur- 
man Coast; Nova Zembla (Herzenstein 1893; Leche 1878). — Spitzbergen (Torell 
1859); Stor Fiord (1. 6.3, Knipowitsch 1901"). — Jan Mayen (Becher 1886). — Off 
Norway, 300 fms, dead shell (FRIELE & GRIEG 1901). — Iceland (Odhner 1910). — 
Greenland from Upernivik southwards, 100 fms, 1. 7 (Posselt & Jensen 1899). — Jones 
Sound, 10—20 m, 1. 7.5 (Grieg 1909). — Parry Islands, 12—15 fms (Sutherland 1852). 
— E. Canada, 20—35 fms (WHITEAVES 1901). — Newfoundland (Verkräzen 1877). — 
Alaska (fide Posselt & Jensen 1899). Depths 3—300 fms. Rocks, stones, sand, 
clay, alge. 
Acme&ea patina EscHscHOoLTzZ 1833. 
(= Patella testudinalis forma normalis Auvrivinnius 1887). 
IP SenoRS: 
Habitat: 
Behring Island, 0—1 fms, stones, alg&e, many sps, max. 1. 33.5; br. 26.7; h. 
10:2; apex 11.9 (Vega Exp. js 1879). 
Limits of formal variation (100 sps): 
16—18 | 20—22 | 24—26 | 28—30 | 32—34 
si 
| br. 11—14 113.8—17 | 17—21 120.4—24.6] 24—27 
| h. J0—50 | A= AGS | 6.4—10.2 His-=TIE6 
I | | I 
| apex | 3—5.6 | 4—7 5.4—9.6 | 6.8—11.8| 9.4—13.8| 
General Distribution: 
Behring Island (DaArL 1887); Alaska, Aleutian Islands to San Diego, California 
(DALL 1878). 
Acme&ea persona EscHSCHOLTzZ 1833. 
Habitat: 
Behring Island, 0—1 fms, among A. patina and A. pelta, 15 sps, max. l. 11.1; 
br. 8.2; bh. 3.5; apex 1:2 and 1. 10; br. 8; h. 3.2; apex L:3. The specimensbelongrto 
the smooth forma typica. 
