34 000 



27000 



52000 



■"000 



;30oo 

 10 coo 



JUNE 2-19 1929 



DIATOMS 



GREEN ALGAE 



BLUE GREEN ALGAE 



JULY 2-15 1929 



DIATOMS 



GREEN ALGAE 



^BLUE GREEN ALGAE 



A 



I 3 4 5 6 7 9 M 53 24 

 STATONS EAST ma^ 



Figure 51. --Distribution of the major groups of phytoplankton June and July, 1929. 



138 



