PLANKTON VOLUMES 

 JUNE I960 



CC. OF PLANKTON PER ipOO M.-" 

 OF WATER STRAINED 



1-33 



34-100 



101-300 

 I 301-900 

 I OVER 900 



STATIONS OCCUPIED 



Figure 9. — Plankton volumes, June 1960. 



32 



