Figure 6. Population distribution of individual species of plankton during the spring- 

 summer period of 1952. 1. Themisto libellula ; 2. Oithona similis; 3. Pseudo 

 calanus elongatus; 4 

 abyssorum ; 7 



Aglantha digitale; 5 . Oikopleura labradoriensis ; 6 . Them. 

 Limacina retroversa; 8 . Meganyctiphanes norvegica; 9 . 



Physophora hydrostatica . 



The Norwegian Sea is under the constant influence of the Norwegian current, and consequent- 

 ly typical warm-water organisms are widespread in it. In addition to the above-mentioned usual 

 mass species, warmth-loving species such as Collozoum groenlandicxmi , Physophora hydrostatica , 

 Tomopteris helgolandica , Metridia lucens , M. venusta , Rhincalanus nasutus, Pleuromamma 

 robusta, Euchaeta spinosa , Megany cti phane s norvegica, Nematoscelis megalops , Limacina retro- 

 versa and others are found almost everywhere (see Figures 1, 8 and 9). 



87 



