1920] 



Allen: Plankton of the San Joaquin River 



223 



2 — Organisms Per Cubic Meter in Plankton of 

 San Joaquin River in 1913 — (Continued) 



1913 

 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 

 II 1 

 11/ 8 

 11/15 

 11/22 

 11/30 

 12/ 6 

 12/14 

 12/20 

 12/27 



Brachionus 

 urceus 



25,600 



3,200 



38,400 



12,800 



105,792 



51,200 



6,400 



38,400 



12,800 



12,800 



12,800 

 12,800 



3,200 



Diurella 

 egg, free 



79,344 



l.-,st,ss 

 1,031,472 

 476,064 

 317,376 

 423.16S 

 158,688 

 528,960 

 1,110,816 

 317,376 



952,128 



528J960 



S46.336 



528,960 



105,792 



25,600 



I J, Mill 



64,000 

 76,800 

 12,800 

 64,000 

 38, 100 

 38,400 

 12,800 



r_\Min 



Epiphanes 



egg, attached 



female 



6,400 



12,800 



12,800 



25,600 



Filinia 



egg, attached 



female 



9,600 



Filinia 

 egg, free 



1,600 

 1,600 



238,032 



3.200 

 528,960 



3,200 

 15X.0SS 

 158,688 

 528,960 



105,792 

 105,792 

 ■21 1,584 

 105,792 

 105,792 



1913 

 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 

 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 



Filinia 

 longiseta 



79,344 



57,600 



290,928 



44,800 



38,400 



2s. Mill 



3,200 



3,200 



1,600 

 6,400 



12,800 



6,400 



57,600 



3,200 



9,600 



400 

 1,200 



1,200 



3,200 



6,400 



12. si III 



99,200 



32,000 



238,032 



211,584 



555. 41 IS 

 264,4X0 

 264.480 

 105,792 

 793,440 

 132, 240 

 6,400 



38,400 



12,800 



38,400 



32,000 



211,584 



238,032 



555,408 



1,798,464 



634,752 



25,600 



Keratella 

 egg, attached 



800 



1,200 



l.iioo 



16,000 



6,400 



25.600 



12,800 



158,688 



52,896 



211,584 



79,344 



1,600 



1,600 



1.600 



1,600 



6,400 



9,600 



79,344 



Keratella 

 egg, free 



1,200 



2,400 



19,836 



33,060 



17,000 



132,240 



132,240 



6,400 



1,600 



132,240 



79,344 



79.344 



185,136 



3,200 



1,600 



3,200 



105,792 



3,200 



105,792 



105,792 



3,200 



l.-,S.!iSS 



1,600 

 185,136 

 423, 16S 

 211,584 



Keratella 

 quadrata 



1,200 

 1,200 

 1,600 

 1,200 

 20,800 

 22,400 

 6,400 

 6,400 



19,200 



9,600 

 79,344 

 158,688 

 19,200 

 28.S00 

 105,792 

 41,600 

 79,344 

 44,800 

 3,200 

 12,800 

 38,400 



15X.0XS 

 9,600 



12.X00 



3,200 



57,600 



12,S00 



12,800 



