12° 



32° 



30 



28" 



26 



24° 



118° 



CC. OF PLANKTON PER 1,000 M; 

 OF WATER STRAINED 



-33 

 34-100 



101-300 

 301-900 



° STATIONS OCCUPIED 



IIO°W. 



PLANKTON VOLUMES 

 SEPTEMBER I960 



116° 114° 112 



Figure 12. — Plankton volumes, September 1960. 



32° 



N 



43 



