1920] 



Alle)i: Plankton of the San Joaquin River 



183 



Table 1. — Organisms Per Cubic Meter in Plankton of 

 Stockton Channel in 1913 — (Continued) 



1913 



9/ 2 



9/ 6 



9/ 9 



9/13 



9/17 



9/20 



9/24 



9/27 



10/ 1 



10/ 4 



10/ 8 



10/11 



10/15 



10/18 



10/22 



10/26 



10/29 



11/ 1 



11/ 5 



11/ 8 



11/12 



11/15 



11/19 



11/22 



11/26 



11/30 



12/ 3 



12/ 6 



12/10 



12/14 



12/17 



12/20 



12/24 



12/27 



12/31 



Brachionus 



egg, free 



female 



Brachionus 



egg, free 



male 



Brachionus 



Brachionua 

 plicatilis 



634,752 

 846,336 

 793,440 

 1,057,920 

 370,272 

 687,648 

 476,064 

 370,272 

 370,272 

 952,128 

 793,440 

 952,128 

 634,752 

 952,128 

 52,S,960 

 264,480 

 317,376 

 105,792 

 105,792 

 158,688 

 52,896 



238,032 



370,272 



132,240 



449,616 



449,616 



1.58,688 



46,284 



119,016 



33,060 



66,120 



26,448 



72,732 



105,792 



6,400 

 '6!460 



Brachionus 

 urceus 



96,000 



105,792 



211,584 



211,584 



12,800 



19,200 



121,600 



264,480 



158,688 



105,792 



158,688 



105,792 



211,584 



44,800 



32,000 



6,400 



12,800 



52,896 

 3,200 

 9,000 

 1,600 

 6,400 

 3,200 

 3,200 

 800 

 1,600 



Brachionus 



with 



endoparasites 



6,400 



800 



1913 



Diurella 

 egg, free 



1/ 5 

 1/ 8 

 1/12 

 1/15 

 1/19 

 1/22 

 1/26 

 1/29 

 2/ 2 

 2/ 5 

 2/ 8 

 2/12 

 2/15 

 2/19 

 2/23 

 2/26 

 3/ 1 

 3/ 5 

 3/ 8 

 3/12 



Diurella 

 tenuior 



Epiphanes 

 clavulata 



Filinia 

 brachiata 



Filinia 



egg, attached 



female 



400 



Filinia 

 egg, attached 

 male 



2,400 



