1920] 



Allen: Plankton of the Swn Joaquin River 



209 



Table 2. — Organisms Per Cub 

 San Joaquin River in 



1913 



3/15 



3/23 



3/29 



4/ 5 



4/13 



4/19 



4/26 



5/ 3 



5/10 



5/17 



5/24 



5/31 



6/ 7 



6/16 



6/21 



6/28 



7/ 5 



7/12 



7/19 



7/26 



8/ 2 



8/ 9 



8/15 



8/23 



8/31 



9/ 6 



9/13 



9/20 



9/27 



10/ 4 



10/11 



10/18 



10/26 



11/ 1 



11/ 8 



11/15 



11/22 



11/30 



12/ 6 



12/14 



12/20 



12/27 



Spirogyra 

 sp. 



1,600 

 3,200 



3,200 



6,400 



12,800 



Staurastrum 

 A 



3,200 



1,600 



1,600 



52,.S!)(1 



105,792 



12,800 



158,688 



6,400 



476,064 



211, .584 



423,168 



317,376 



211,584 



740,544 



1,057,920 



740,544 



211,584 



211,,584 



105,792 



1,600 

 1,600 



Staurastrum 

 sp. 



ic Meter in Plankton of 

 1913 — (Continued) 



Total 



1,600 



3,200 



1,600 



3.200 

 3,200 

 423,168 

 10.5,792 

 317,-376 

 423,168 



317,376 

 105,792 

 105,792 



10.5,792 

 105,792 



Total 

 Conjugatae 



3,200 



11,200 



6,400 



252,432 



3,200 



6,400 

 3,200 

 6,400 

 9,600 

 12,800 



1,600 



12,800 



6,400 



17,600 



60,896 



667,600 



392,672 



653,952 



838,240 



1,205,292 



.5.32,160 



865,536 



5,206,608 



817,344 



1,836,864 



1,599,680 



766,144 



423,068 



660,350 



105,792 



6,400 



62,688 



6,400 

 9,600 

 3,200 

 4,800 

 5,200 

 80,944 



Chlorophyll 

 bearing 



ll,.'i62,384 



10,227,840 



16,907,984 



5,806,320 



9,,506,S48 



14,702,392 



11,812,464 



8,145,788 



10,720,192 



17,202,816 



12,260,192 



24,202,408 



24,771,432 



17,318,816 



20,.54,8,016 



31,173,494 



15,385,292 



30,992,964 



5x,r,2(i,2s0 



6I).(I()4,S!»6 



114,102,688 



100,712,962 



101,975,404 



214,321,570 



196,911,420 



226,118,120 



148,511,000 



137,1-10,848 



90,015,440 



90,224,744 



147,1.52,.542 



84,014,960 



58,621,362 



29,859,648 



14,369,824 



11,064,384 



13,861,008 



22,768,-336 



16,767,936 



9,313,272 



7,212,112 



6,237,032 



Total 

 Algae 



11,291,504 



9,487,296 



15,208,872 



5,957,008 



9,134,224 



14,.595,000 



11,634,.576 



7,879,708 



10,508,608 



17,074,624 



12,148,000 



23,197,384 



23,848,336 



16,7.54,6.56 



20,261,432 



31,110,998 



14,671,196 



29,847,700 



.52,641,128 



52,222,784 



111,419,488 



97,689,996 



99,939,6.56 



210,788,8.34 



193,606,268 



221,4.53,864 



143,032,200 



1-3.3,713,304 



8-5,11-3,408 



82,463,-528 



141,298,-382 



75,.340,016 



.50,145,202 



25,702,-368 



10.931,-584 



6,836,096 



6,791,392 



18,-321,872 



11,490,-384 



6,316,648 



4,901,-5-36 



5,440,392 



Ceratium 

 hirundinella 



1/ 5 

 1/12 

 1/19 

 1/25 

 2/ 2 

 2/ 8 

 2/15 

 2/23 

 3/ 1 

 3/ 8 

 3/15 

 3/23 

 3/29 

 4/ 5 

 4/13 



Cercomonas Chlaniydomonas Chromulina 

 crassicauda sp. sp. 



Dinobryon 

 sertularia 



2,228,244 



826,500 



1,428,192 



2,962,176 



2,856,-3.84 



2,300,976 



740,544 



52,896 



52,896 



290,928 



978,576 



105,792 



158,688 



1,600 

 3,200 



Eudorina 

 elegans 



400 



2,800 



2,000 



800 



30,800 



22,400 



19,200 



158,688 



22.400 



28,800 



1.58,688 



502,512 



6,400 



25,600 



