1920] 



Allen: Plankton of the San Joaquin River 



219 



Table 2. — Organisms Per Cubic Meter in Plankton of 

 San Joaquin River in 1913 — (Continued) 



1913 



2/ 8 



2/ 5 



2/23 



3/ 1 



3/ 8 



3/15 



3/23 



3/29 



4/ 5 



4/13 



J/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 



Collotheca 

 egg, attached 



Collotheca 

 pelagica 



Collotheca 

 sp. 



Total 

 Rhizota 



Rotaria 

 neptunia 



83,200 

 83,200 



12,800 



12,800 

 128,300 



7'SSOO 

 211,584 

 105,792 



25,600 

 3,200 



158,688 

 317,376 



38,400 



51,200 



38,400 



140,800 



115,200 



51,200 



211,584 



12,800 



6,400 



25,600 



3,200 



6,400 

 6,400 



248,288 



400,576 



12,800 



51,200 



51,200 



51,200 



268,800 



192,000 



262,784 



317,376 



12,800 



6,400 



51,200 



6,400 



3,200 



3,200 



6,400 

 12,800 



12,800 



25,600 

 25,600 

 12,800 



6,400 



6,400 



3,200 



Rotaria 

 rotatoria 



57,600 

 12,800 

 79,344 

 32,000 

 80,000 

 79,344 

 1S5,136 

 22,400 

 9,600 



6,400 

 6,400 



3,200 



6,400 

 12,800 



19,200 



6,400 



12,800 



25,600 



105,792 



12,800 



12,800 



6,400 



6,400 

 6,400 

 6,400 



1913 



1/ 5 

 1/12 

 1/19 

 1/25 

 2/ 2 

 2/ 8 

 2/15 

 2/23 

 3/ 1 

 3/ 8 



Rotifer egg, 

 winter 



3,200 



Rotifer ei;g. 

 unidentified 



1,600 



Rotifer 

 unidentified 



800 

 6,000 

 6,400 



19,200 

 3,200 



12,800 

 1,600 



52,896 



Total 

 Bdelloida 



2,000 



4,400 



.54,096 



34,848 



113,792 



76,800 



16,000 



92,144 



33,600 



132,240 



Anureaopsis 

 fissa 



Anureaopsis 

 sp. 



