336 



University of California Publications in Zoology [Vol.22 



fresh water. It therefore seems certain that, considering the group 

 as a whole, we have in this case a normal seasonal sequence. It is not 

 so certain that the production of species or even genera involved 

 follows any established course at least so far as has yet been detected 

 or predicted. 



~ 1~5 

 en 



3 Q-io 



j3 11-15 



en 16-20 

 m 



" 21-25 

 26-30 



1- 5 

 O 6-10 



<3 11-15 



m 16- 20 

 ;o 



21-25 



26-31 



z 1-5 



< 6-10 

 m 



3 11-15 



03 



3 16-20 



21-25 

 26-30 



F} 6~lo 



rn 



211-15 



CD 



mi6~2o 



TO 



21-25 



26-31 



In connection with the high productivity so suddenly appearing in 

 September, I was very much interested to note that for two or three 

 days previously there had been rather strong and constant currents 

 from the north. Also, large numbers of mackerel came to the region 

 of our pier in the latter part of August and left as high production 

 of diatoms began. Whether these facts were simply coincidences or 

 whether they had significant relationship to increased diatom produc- 

 tion I do not have means of knowing. 



Graph shownd avt3rao& 

 nvm&ors of dt&tom ce//s pt?f 

 //&v- /rt success/ye f/vc? day 

 pen'oc/s fhro^qh terf four 

 mor-ifhs of 79 J 'S. £acfi Jp'uare 

 m/f/imefei' of 6/acA ai-ea /-ep- 

 resonts 9000 a'/'afoms. 



