CC OF PLANKTON PER 1000 CM 

 OF WATER STRAINED 



0-33 

 34-100 

 ^P 101-300 

 ^M 301-900 

 ^M OVER 900 

 o STATIONS OCCUPIED 



PLANKTON VOLUMES 

 SEPTEMBER 1957 



Figure 12. — Plankton volumes, September 1957 



I 



48 



