1899] Some Hydrographical Eesnlts. 25 



of Tromso county are also clistinguishedj among other things, by 

 their yielding a principal rontribution to supplyiiig the Lofoten 

 fishermen with herring bait. — 



Another plankton observatioii I will mention bere. In the 

 Mosken stream were observed March Ist, 1899 several specimens 

 of arachnactis albida, M. Såes, plujsophora horealis, M. Såes, and 

 agalmopsis elegans, M. Såes. All these are by Aueivillius refer- 

 red to the northern Gulfstream plankton. Two of them have 

 previously been reported from the west coast of Norway at winter- 

 time, but for physoijliora horealis are given as finding time and 

 place : 



Bodo (67° 15' N.), May— June (M. Såes). 



Lofoten, June (G. 0. Såes). 



Vadso, June 1878 (Che. Aueivillius). 

 It has however now been proved that also this siphonophor may 

 appear in winter. — The other one of the siphonophores mentioned 

 {agalmo])sis) was during the winter of 1899 very common along the 

 northern coast and in the fjords. I may mention as a curiosity 

 that I saw a fisherman in Kvænangen whose gloves bad a reddish 

 stripe deri v ed from the remnants of agalmopsis that bad stuck 

 to the fishing lines. More rarely ctenophores occurred. Several 

 times however I saw a large lobod form that in all probability was 

 holma septentrionalis. 



In the rep orts of the North Ocean Expedition seas are divided 

 into a warm area and a cold one. The latter comprises all the 

 region where the bottom temperature is 0^ or less. Afterwards 

 Hjoei' and Gean (5, p. 4j have undertaken a vertical division of 

 the coast sea: 



1. The Region of periodical changes to a depth of 200 to 250 

 metrés. 



2. The Atlantic Region, to a depth of about 500 metres. 



3. The Arctic Region. 



This division may prove expedient, but the statement of the bor- 

 ders of the regions will be modified in some degree. 



If the division is applied to the fjords I have grouped in 

 class L it may consequently be said that the region of changes 

 goes to 200 — 250 m. (as stated), and the Atlantic region from 

 thence to the bottom. In the fjords of the second group one is 

 obliged to say that the region of changes goes from the surface 

 to the very bottom. Further, the Atlantic water outside the ocean 



