396 
har „Ingolf“ faaet talrige levende Eksemplarer paa adskillige 
Stationer indenfor det nævnte Havomraade, men ingensteds paa 
Dybder, der ere mindre end 124 Favne eller større end 495 Fv. 
Denne Form gaar derfor næppe ned til de 1003 eller 1309 Fv., 
og omvendt holder den sig paa saa stort Dyb, at den er uden 
for Isens Eækkevidde. Denne Bivalv er nemlig, mig be¬ 
kendt, ikke taget paa Dybder , der ere mindre end 40 Fv. 
(Kara Havet), og som oftest holder den sig meget dybere“. 
2) The occurrence of dead sballow-water sbells at great depths in 
tbe Kortb Polar Basin is a very common pbenomenon. The 
sbell-transportation by means of floating ice is, on tbe contrary, 
ratber unimportant., Tbe tbeory of transportation tberefore does 
not give a sufficient explanation of tbe frequent occurrence of 
tbese peculiar mollusc-forms. (Fr. Kansen 1. c. W. Brøgger 
1. c. iV. S. Jensen 1. c. 1900.) 
3) The found sbells of bivalves are undamaged and can often be 
matched; moreover now and then tbey are United by a part 
of tbe ligament or by tbe binge. If tbe sbells had been trans¬ 
ported by tbe ice tbey migbt not be supposed to have been so 
well preserved (A. S. Jensen 1. c. 1900 p. 231 & 232). 
4) Tbe area on wbicb tbese dead sballow-water sbells are deposited 
has a well marked limitation. In tbose parts of tbe Atlantic 
soutb of tbe submarine ridges Færoe-Iceland and Iceland- 
Greenland, as well as in tbe Davis Strait, a similar occurrence 
of sballow-water sbells at great depths does not exist, wbat 
migbt be expected if tbe occurrence was a result of transporta¬ 
tion by floating ice (A. S. Jensen. 1900. 1. c. p. 237). 
To tbe first point tbe following objection may be set fortb: 
A. S. Jensen’s statement Portlayidia intermedia does not occur 
at lesser depths tban at 40 fms. is witbout doubt incorrect. Lecbe ^) 
M W. Lecbe: „Ofversigt ofver de af Vega-Expeditionen insamlade arktiska 
bafsmolliisker^. Vega-Expeditionens vetensk. lagtt. Bd. 3. Stockholm 
1883. p. 446. 
s 
