68 NILS ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. V. PROSOBRANCHIA. 1 DIOTOCARDIA. 
1868) 1 sp., h. 2.7. — Waygat Islands, 60 ims, clay (1861) 4 sps, max. h. 2.5. — 
King Charles Land, 78” 50' N., 27” 39 E., 20 m, fine reddish yellow clay, bottom 
temp. + 0.2? ("”/& 1898) 1 sp, h. 2:7; ap:l.s; di 3.1. ='D:o; Bremer Sound; 100=110 
m, fine clay with big stones, Biloculina sparse, bottom temp. —L1.45” (5/s 1898) 4 sps, 
max. h. 21. — D:o, Swedish Foreland, 10—16 m, fine blackish-gray sand, stones, 
clay, alge ("/s 1898) 3 sps, max. h. 2.8. 
Iceland (ODHNER 1910). Dimensions: Öfjord, h. 3; ap. 1.5; d. 3; wh. 5, 
Fig. 38. 
Greenland (POSSELT & JENSEN 1899). Dimensions: Pröven, h. 4.3; ap. 2.2; 
d. 4.3; wh. 4 ”/., Fig. 40. — Upernivik, h. 3; ap. 1.5; d. 3.22 — Further: Kingitok, 
73” 17 N., 56” 10' W., 27 m, hard stony bottom (EE. Nilson "6 18942)/0lspörd ls. 
— Cape Dudley Digges, 30—40 m, mud (E. Nilson ”/ 1894) 10 sps, max. d3. 
Variation of the radula (cfr. Pl. 6 fig. 6): This — like the shell — is very 
constant for different districts, being of the formula 40—50 . 0.5.1.5.0.40—50. 
There is no transitory lateral tooth. The central and outer median teeth are fur- 
nished with about 6 strong denticles on either side. The tooth outside the Sth me- 
dian one differs from the others by having comb-like denticulation restricted to 
its outer margin. Its denticles are denser, finer and blunter than those of the median 
teeth, in this respect agreeing with the outmost teeth or lamell&e, to which it there- 
fore must be reckoned. On the 6 first of these a denticulation is evident, but on the 
following it disappears. The outermost lamelle are very long and pin-shaped. 
In its form this radula shows agreement with Margarita in its great number 
of median teeth and lamelle, but differs from the latter by the denticulation of the 
lamell&e occuring only in their outer margin and by the absence of a lateral tooth 
mediating between lamelle and median teeth. 
General Distribution: 
Greenland to 300 fms (Posselt & Jensen 1899). — Iceland (Odhner 1910). —- 
Spitzbergen, Norwegian Islands, 115—146 fms (Friele 1879); Stor Fiord, 20 m (Kni- 
powitsch 1901"). — White Sea (Herzenstein 1893). — Parry Islands (Sutherland 1852). 
— Behring Sea (Krause 1885). Puget's Sound (Carpenter 1864). Depths 10—300 
fms. Sand, stones, clay, alge. 
Solariella levis FRIELE 1886. 
Distribution: North Atlantic, W. of Norway, 300—350 fms, Norwegian North-Atlantic Expedition St. 
124 and 173 b (Friele 1886). 
