28 KILS ODHNEE, NORTHERN AND ARCTIC INVERTEBRATES. V. PROSOBRANCHIA. 1 DIOTOCARDIA. 



General Distribution: 



Norway: Tromsö to Vadsö, 10-14 fms (1. 6, G. 0. Sars 1878; Loven 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 190P). - 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 (Verkriizen 1877). — 

 Alaska {fide Posselt & Jensen 1899). Depths 3 — 300 fms. Rocks, stones, sand, 

 clay, algse. 



Acmsea patina Eschscholtz 1833. 



(= Patella testudinalis forma iiormalis Aueivillius 1887). 



PI. 1 fig. 8. ' ■ ■ 



Habitat: 



Behring Island, — 1 fms, stones, algse, many sps, max. 1. 33.5; br. 26.7; h. 

 10.2; apex 11.9 (Vega Exp. ^'Vs 1879). 



Limits of formal variation (100 sps) : 



1. 



16—18 



20—22 



24-26 



28—30 



32—34 



br. 



11—14 



13.8—17 



17—21 



20.4—24.6 



24—27 



h. 



3.8—5.6 



4.8—7 



5.6—8.8 



6.4—10.2 



7.8—11.6 



apex 



3—5.6 



4—7 



5.4—9.6 



6.8—11.8 



9.4—13.8 



General Distribution: 



Behring Island (Dale 1887); Alaska, Aleutian Islands to San Diego, California 

 (Dall 1878). 



Acmaea persona Eschscholtz 1833. 

 Habitat: 



Behring Island, 0—1 fms, among A. patina and A. pelta, 15 sps, max. 1. ll.i; 

 br. 8.2; h. 3.5; apex 1.2 and 1. 10; br, 8; h. 3.2; apex 1.3. The specimens belong to 

 the smooth forma typica. 



