In the spring and summer of 1953 (Figure 4) the largest quantity of P. elongatus was observed in 

 the southern part of the Norwegian Sea, to the north of the Faroes in latitude 63°N and longitude 3° 

 W, in the north- central and central areas of the Norwegian Sea in the western current and in the 

 area east of Jan Mayen. Above latitude 72 N, the quantity of P. elongatus diminishes. 



Figure 3. Surface temperature distribution in June 1953. 1. Calanus hype rbo reus ; 2. 

 Metridia longa; 3. Limacina retroversa; 4. Nemjatoscelis megalops ; 5. 

 Themisto libellula; 6. Collozoum groenlandicum . 



The Amphlpoda group (Themisto abyssorum , Th. compressa f^. compressa, and others) 

 occupies second place. Themisto compressa f . compressa is a relatively warm-water form of 

 Amphipoda and has been observed by us mainly in the southern part of the Norwegian Sea along the 

 coasts and in the coastal current. The most numerous species of this group are Themisto abyss - 

 orum and Themisto libellula . 



Themisto abyssorum is widespread in the central part of the Norwegian Sea and in the 

 southern areas of the Greenland Sea. Themisto libellula is a cold-water species and its habitat 

 lies to the north of that of Th. abyssorum (Figures 5 and 6) where the temperature ranges from 

 -K).l to -0.7°C and the salinity Is 34.55" /oo. 



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