% 
36 Dr. B. Lysholm and O. Nordgaard. 
According to T.scorri) specimens were obtained on july 24 
1898 by wituiam s. BRUCE in Kval Sound, a little north of 
Tromsø. Kval Sound, at about 70° N. Lat. is the northern limit 
of the species as hitherto known. From the Trondhjemfjord 
it is noted by dr. rysHorm» (*°/7 1903, 0 m.). 
Pontella wollastoni Luspock is recorded from the southern 
coast of Norway by a.o: SARS» and from the Bergen coast by 
NORDGAARD!). 
The above list of species is not complete, but it is perhaps 
sufficient to give an idea as to the immigration of southern forms 
into the Noiwegian sea by the North Atlantic current. Among 
the species above mentioned, there is no typical Atlantic deep- 
sea form. This fact is not surprising. In the collections of the 
Armauer Hansen 1913 there were several species of Atlantic 
deep-sea forms, such as Metridia princeps, Lucicutia grandis, etc. 
On studying the work of c. WITH, it is evident, that many Atlan- 
tic forms go up to the Denmark strait, and partially into the Davis 
strait. Neither the planktonic nor the benthonic fauna of Green- 
land is distinctly or purily arctic. This may easily be seen by 
comparing the works of TH. MORTENSEN (Echinodermata), POSSELT 
et AD. SEV. JENSEN?) (Mollusca), K. STEPHENSENS) (Crustacea). And 
the cause of this must be caught in the prevailing hydrographi- 
cal conditions. In G. Scott’s book”) on the Atlantic ocean we 
see (fig. 58. p. 183), that a branch of the Atlantic current pene- 
trates into the Denmark strait, and another turns westwards along 
the coast of Greenland. The heterogeneous character of the 
Greenlandic fauna is thus easily explained. But we cannot expect 
to find Atlantic deep-sea forms in the Norwegian Sea, as the 
separating ridges are comparatively high, and cold water flows 
over these ridges into the Atlantic. 
DE Et AG. Sap. 2 340: 
NTP på: 
a AG. Nu pA 
5 i Aa) 6 Ra pi 19. 
MED. I 
MERE. 
ME Gi. 
DAG. C.LP.G 
DIG AD: 
