1920] 



Allen: Plankton of the San Joaquin River 



187 



Table 1. — Organisms Per Cubic Meter in Plankton op 

 Stockton Channel in 1913 — {Continued) 



1913 



11/22 

 11/26 

 11/30 

 12/ 3 

 12/ 6 

 12/10 

 12/14 

 12/17 

 12/20 

 12/24 

 12/27 

 12/31 



Filinia 

 egg, free 



185,136 



105,792 

 52,896 



19,836 



Filinia 

 longiseta 



1,600 



1,600 



Keratella 

 cochlearis 



48,000 



51,200 



52,896 



57,600 



3,200 



1,600 



800 



1,600 



1,600 



Keratella 

 egg, attached 



22,400 

 2.S,S00 

 19,200 

 52,896 

 52,896 



6,400 

 72,732 



4,000 

 46,284 

 13,224 

 26,448 

 66,120 



Keratella 

 egg, free 



423,168 

 79,344 



105,792 

 52,896 

 .52,896 



46,284 



1,600 

 19,836 

 19,836 

 39,672 

 79,344 



Keratella 

 male 



Keratella 

 quadrata 



Lecane 

 luna 



1913 



1/ 5 26,448 



1/ 8 92,568 



1/12 79,344 



1/15 152,076 



1/19 85,9.56 



1/22 39,672 



1/26 231,420 



1/29 323,928 



2/ 2 198,360 



2/ 5 125,628 



2/ 8 423,168 



2/12 1,124,040 



2/15 11,200 



2/19 79,344 



2/23 251,256 1,600 



2/26 132,240 



3/ 1 16,000 



3/ 5 41,600 1,600 



3/ 8 925,680 



3/12 317,376 



3/15 343,824 



3/19 952,128 



3/23 740,.544 



3/26 1,084,368 



3/29 2,142,288 



4/ 2 3,385,-344 



4/ 5 4,205,232 



4/ 9 3,041,520 



4/13 925,680 



4/16 1,719,120 



4/19 4,205,2.32 



4/23 2,195,184 



4/26 2,459,664 



4/.30 2,010,048 



5/ 3 1,613,328 



5/ 7 3,067,968 



5/11 5,104,464 



5/14 2,909,280 



5/17 1,005,024 



5/21 1,. 322,400 



5/24 317,376 



5/27 740,544 



5/31 846,3.36 



6/ 3 1,533,984 



Notholca 

 striata 



400 



800 



Notommata 

 aurita 



3,200 

 3,200 



3,200 



400 



6,400 



Polyarthra 

 trigla 



Polyarthra trigla 



egg, attached 



female 



1,200 



39,672 



800 



800 



19,836 



66,120 



1,600 



19,836 



105,792 



39,672 



4,800 



14,400 



105,792 



28,800 3,200 



79,.344 



370,272 



581,856 



1.58,688 



238,032 3,200 



1.32,240 



25,600 



79,344 52,896 



105,792 1,600 



15S,(iSS . . 



390,720 52,896 



1,110,816 1.58,688 



1,. 560,432 290,928 



766,992 1,600 



1,772.01(1 555,408 



370,272 1.58,688 



2,644,800 132,240 



2,062,944 528,960 



1,216,608 238,032 



3,147,312 105,792 



2,724,144 185,1.36 



528,960 



264,480 



57,600 

 38,400 

 19,200 



19,200 



10.5,792 ...; 



