1920] Allen: Plankton of the San Joaquin Bi/ver 215 



Table 2. — Organisms Per Cubic Meter in Plankton op 

 San Joaquin River in 1913 — (Coidinued) 



Actinophrys Heterophrys Heterophrys Nuclearia Pinaciophora Raphidiophrys 



1913 sol. ' fockei sp. simplex fluviatilis elegans 



10/ 4 2,962,176 •. 



10/11 317,376 1,269,504 



10/18 12,800 423,168 



10/26 12,800 105,792 317,376 



11/ 1 105,792 



11/ 8 52,896 



11/15 52,896 1,481,088 



11/22 .. 1,600 



11/30 1,600 1,600 



12/ 6 



12/14 



12/20 : 



12/27 ■ 



Total Chilodon Ciliate Coleps Cyclidium Epistylis 



1913 Heliozoa sp. unidentified hirtus sp. sp. 



1/ 5 



1/12 



1/19 ■ 400 



1/25 400 



2/ 2 1,600 



2/ 8 6,400 



2/15 1,600 



2/23 ^ 6,400 



3/ 1 79,344 



3/ 8 3,200 



3/15 1,600 



3/23 1,600 1,600 



3/29 3,200 



4/ 5 185,136 3,200 



4/13 



4/19 



4/26 



5/ 3 : 105,792 



5/10 



5/17 



5/24 



5/31 



6/ 7 12,800 



6/16 



6/21 52,896 



6/28 



7/ 5 



7/12 3,200 



7/19 476,064 



7/26 : 



8/ 2 423,168 



8/ 9 426,368 105,792 



8/15 429,568 105,792 



8/23 317,376 3,200 



8/31 211,584 105,792 105,792 



9/6 634,752 105,792 



9/13 144,192 105,792 



9/20 1,388.096 



9/27 1,586,880 



10/ 4 2,962,176 



10/11 1,586,880 105,792 



10/18 435,968 



10/26 435,968 



