1920] 



Allen: Plankton of the San Joaquin River 



147 



Table 1. — Organisms Per Cubic Meter in Plankton of 

 Stockton Channel in 1913 — {Continued) 



1913 



9/ 9 

 9/13 

 9/17 

 9/20 

 9/24 

 9/27 

 10/ 1 

 10/ 4 

 10/ 8 

 10/11 

 10/15 

 10/18 

 10/22 

 10/26 

 10/29 

 11/ 1 

 11/ 5 

 11/ 8 

 11/12 

 11/15 

 11/19 

 11/22 

 11/26 

 11/30 

 12/ 3 

 12/ 6 

 12/10 

 12/14 

 12/17 

 12/20 

 12/24 

 12/27 

 12/31 



Nitzschia 

 sigma 



105,792 

 52,896 



6,400 

 12,800 

 52,896 



12,800 



3,200 



'3,200 

 3,200 



800 



19,836 



800 

 39,672 



800 

 39,672 



Nitzschia 

 sigmoidea 



Nitzschia 

 vermicularis 



6,400 

 6,400 



Pleurostauron Stauroneis Stephonodiscus 

 parvulum Phoenicenteron sp. 



6,400 

 6,400 



19,200 



12,800 

 52,896 



6,400 

 1,600 



3,200 



800 



105,792 



"52^896 



'52^896 



105,792 



52,896 



"52396 



" "79,344 



"52,896 



h600 



105,792 



1,600 



"33^060 

 26,448 

 19,836 

 33,060 

 400 

 26,448 

 26,448 



400 

 400 



Surirella 



Synedra 

 radians 



1/ 5 



1/ 8 

 1/12 

 1/15 

 1/19 

 1/22 

 1/26 

 1/29 

 2/ 2 

 2/ 5 

 2/ 8 

 2/12 

 2/15 

 2/19 

 2/23 

 2/26 

 3/ 1 

 3/ 5 

 3/ 8 

 3/12 

 3/15 

 3/19 



3,200 

 400 



1,600 

 800 



800 

 4.800 

 3,200 

 6,400 



3,200 

 3!206 

 3,200 



Synedra 

 ulna 



132,240 

 59,508 

 66,120 

 138,852 

 198,360 

 211,584 

 257,868 

 25i;256 

 152,076 

 310,764 

 132,240 

 370,272 

 436,092 

 357,048 

 317.376 

 528,960 

 581,856 

 211, .584 

 238,032 

 158,688 

 370,272 

 290,928 



Total 

 Bacillariaceae 



1,163,712 

 452,016 

 915,6.56 

 3,275,140 

 6,253,140 

 2,858,572 

 774,404 

 1,761,992 

 1,4.54,828 

 1,948,328 

 1,668,624 

 1,656,200 

 2,837,136 

 3.641,776 

 1,766,792 

 5,049,120 

 6,834,784 

 6,621,600 

 2,348,224 

 3,206,608 

 2,925,280 

 4,263,892 



Closterium 

 acerosuni 



400 

 400 



1,600 



Closterium 

 rostratum 



