KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 36. N:0 8. 15 



Remnants from ^^ ^ 



November. ^ew. Total. 



46 



48 



Southern oceanic 21 5 ( 



Southern neritic 18 2) 



Northern oceanic 19 O ' 



Northern neritic 22 71 



January 1902. 



Samples were taken both at Väderöboda and Måseskär, in all fi^'e, but only in the 

 latter half of the month. The number of different forms was considerable, but not so 

 large as in December. I have classified them as follows: 



Remnants from ,^ ^ 



January. ^ew. Total. 



Southern oceanic 16 0( ^^ 



Southern neritic 11 21 



Northern oceanic 16 11 ,. 



Northern neritic 22 2 I 



These figures show that the southern forms had decreased since December, but also 

 that no noteworthy increase in new forms had taken place. 



February 1902. 



Samples were collected throughout the month both at Måseskär and Väderöboda. 

 The samples contained: 



Remnants from ^^ ^ 



January. N<=^- Total. 



Southern oceanic 5 O 1 ,^ 



Southern neritic ^ . . 4 11 



Northern oceanic 6 2, oi 



Northern neritic 19 4 



I 



There had thus since January occurred a considerable decrease in southern form 

 but also in the northern, expecially oceanic forms. 



In February the North Sea was explored as usual by steamers running in different 

 directions and the Skagerak by soundings in many stations. Also the fjords were examined. 

 The result of the combined hydrographic and biological examination has been given in a 

 special report, published by Prof. Pettersson and the present author. 



The plankton of the North Sea and the Skagei-ak had a somewhat raixed charac- 

 ter, but along the coast of Sweden as well as at Skagen northern and arctic diatoms 

 predominated. In the deep Gullmarfjord there remained plankton from earlier periods. 



hl order to find how far the plankton of the North Sea and the Skagerak had 

 changed since August I have worked out the following statistics. 



