zoum in the surface layers, was flowing northward. The slime of radiolaria stopjjed up the plank- 

 ton nets to the same extent as when the mass production of the alga Phaeocystis occurs. Radio- 

 laria were carried north to 80° north latitude by the Spitsbergen current. 



0' y to- li' X- 



Figures. Distribution of the principal plankton complexes in May, 1951. 1. pre-spawnlng 

 accumulations of Calanus ; 2. nauplii and young of Calanus ; 3. red Calanus at 

 the surface; 4. red Calanus descended into the deep; 5. Phaeocystis ; 6. Dia- 

 toms; 7. Calanus hyperboreus ; 8. jellyfish. 



According to our observations such an abundance of the radiolaria Collozoum was encounter- 

 ed only in 1948 and 1949. It suggests an acceleration of the intensity of the Norwegian current. In 

 recent years, Collozoum was very scarce and individual specimens did not penetrate northward be- 

 yond 74-75° north latitude. 



The acceleration of the Norwegian current Intensity in 1954 facilitated the development of 



123 



