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



Iceland (Odhner 1910), var. islandica. Dimensions: h. 4.5; ap. 2.9; d. 5.8; 

 vvh. 4V*, Fig. 24. 



N. W. Atlantic: 52° 25' N., 52° 12' W., 162 fms, loose clay mixed with sand 

 (Lindahl ^Vs 1871) 2 sbs, max. h. 3.7; ap. 2.i; d. 5; wli. 4 V2 (var. bella). — 52° 5' 

 N.,52° 19' W., 161 fms, clay, mixed with sand (Lindahl ^-,8 1871) 1 sh., h. 5.7; ap. 

 3.8; d. 7.7; wh. 4% (type, resembling specimens from Kara Sea, without trace of 

 umbilical keel, but more depressed; determined by Posselt as M. groenlandica). Fig. 18. 



West Greenland (not observed by Posselt): Julianehaab, 25 fms, clay, among 

 M. groenlandica (Amondsen Okt. 1861) 1 sh., h. 4.6; ap. 2.6; d. 5. f.; wh. 4^4 (var. is- 

 landica). — Godthaab, 72 fms, sand, among M. cinerea (Amondsen July 1862) 1 sp., 

 h. 4.7; ap. 2.3; d. 6; wh. 4 \o (var. bella), Fig. 34. ~ Davis Strait, 65° 11' 48" N., 

 53° 33' 48" W., 48 fms, greenish clay (Lindahl 1871) 11 sps, max. h. 4.8; ap. 2.8; 

 d. 6.4; wh. 4 ';2 (var. multilirata, determined by Posselt as M. groenlandica). Fig. 

 28, 29, 30. — Umanak, 200 fms, clay, among M. cinerea (Amondsen 1862) 1 sp., h. 

 5.8; ap. 3; d. 7.i; wh. 5 (var. multilirata, untypical), Fig. 33. — Jakobshavn, 120 

 fms, clay mixed with sand (Oberg s 1870) 1 sh., h. 2.i; ap. 1.7; d. 2.9: wh. 4 (var. 

 multilirata, determined by Posselt as M. cinerea). — Godhavn, 10 — 40 fms, mud (^/e 

 1860) 1 sp., h. 5; ap. 2.r. ; d. 6; wh. 4 \ 2 (var. multilirata, untypical with strong, 

 broadly rounded riblets). Fig. 32. 



East Greenland: King Oscar's Fiord, S. of Ruth's Islands, ca 125 m, mud, 

 sand, pebbles ("^/s 1899) 1 sh., d. l.o; wh. 3 (var. bella). 



Newfoundland Bank, the type: 46° 5' N., 51° 44' W., 56 fms, sand, shells (Lin- 

 dahl "^,8 1871) 3 sps, max. h. 6.4; ap. 3.r>; d. 8; wh. 5; on the whorls 1 upper, 

 stronger, and 3 lower finer revolving ridges; over the strong uppermost ridge there is 

 a trace of a finer one. 



Variation of the shell: 



Kola Poninsula, 



Spitzbergen, 



h. 



4- 



5 



5 



-ü 



Ü— 7 



7—8 



8—9 



max. 9.4 (Veg 



a N:o 1068) 



Behring Sea etc 





ap. 



2.0- 



3.5 



3 



-4 



3.5—4.6 



3.8 — 5.0 



4.4-0 



5.1 





45 sps of forma 



fiipica 



d. 



5— 



G.8 



5.C- 



-7.0 



6.5—8.9 



7.4 — 11.5 



9—11.8 



11.0 





measured 





wli. 



4— 



47--' 



4V> 



--5 



4Vi— 5 



about 5 



>5 



>5 





S]3ecimens from Spitzbergen have a smaller diameter of the shell than those 

 from more eastern districts: their maximal dimensions are not so high (max. h. 7.5 

 etc.. Recherche Bay). 



Norway and Spitzbergen; 



h. 



2.5 



3—4 



4—5 



5—6 



max. 5.7 (Grötsund) 



14 sps of var. hella 



ap. 



1.5 



1.5—2.1 



1.8—24 



2.5—2.8 



2.7 



measured 



d. 



2.8 



3.2—4.5 



4.2—5.3 



5—6.1 



6 1 





wh. 



3'A 



4—5 



47* 



about 5 



5 



Greenland ; 



h. 



2—3 



3—4 



4-5 



5—6 



max. 5.8 (Umanak) 



14 sps of var. multilirata 



ap. 



1.3—2 



1.8—2.3 



2.2—2.9 



2.5—3.5 



3 



measured 



d. 



2.0—4 



3.8—5.2 



4.6—6.7 



6—8 



7.1 





wh. 



3-3Vi 



3'A— 4 



4'A— 4'A 



about 5 



5 



