1920] 



Allen: Plankton of the San Joaquin River 



145 



Table 1. — Organisms Per Cubic Meter in Plankton op 

 Stockton Channel in 1913 — (Continued) 



1913 



8/ 2 

 8/ 6 

 8/ 9 

 8/13 

 8/15 

 S 20 

 s 23 

 8/27 

 8/31 

 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 :; 

 12/ 6 

 12/10 

 12/14 

 12/17 

 12/20 

 12/24 

 12/27 

 12/31 



Na 



6,400 

 3,200 



52,896 



gracilis 



264,480 



15S.6SS 



264, l.so 



2,539,008 



952,128 



1,269,504 



1,110,816 



793,440 



1,322,400 



1,163,712 



846,336 



846,336 



476,064 



370,272 



846,336 



899,232 



476,064 



528,960 



52J896 



264,480 



US. OSS 



158,688 

 52,896 



l.-,s,f,ss 

 105,792 



52,896 



79,344 

 105,792 



To.:; It 

 105,792 



10.1.702 

 19,836 

 46,284 

 39,672 

 46,284 

 46,284 

 66,120 

 92,568 



KTayicula 



viridis 



Nitzschi: 

 aciculari 



3,385,344 



3.702,720 



3,279,552 



6,453,312 

 1,586,880 

 634,752 

 1,005,024 

 2,539,008 



4,760,640 



5,236,704 



3,596,928 



2,115,840 



1,904,256 

 2,010,048 



2,750,592 



3,332,448 

 2,750,592 

 3,120,864 



1,533,984 



1,745,568 

 1,904,256 

 2,062,944 

 2,221,632 

 2,062,944 

 1,163,712 



1,745,568 



1,322,400 



1,005,024 



1,322,400 



3,173,760 



1,851,360 



3,200 1,719,120 



2,062,944 



2,036,496 



2,002.0 11 



1,163,712 



3,200 1,666,224 



568,632 



416,556 



310,764 



138,852 



119,016 



145,464 



400 79,344 



3,200 



1913 



1/ 5 

 1/ 8 

 1/12 

 1/15 

 1/19 

 1/22 

 1/26 

 1/29 

 2/ 2 

 2/ 5 

 2/ 8 



Nitzschia 

 sigma 



19,836 



Nitzschia 

 sigmoidea 



Pleurostauron Stauroneis 



parvulum phoenicenteroi 



6,612 



800 



400 



26,448 



39,672 



26,448 800 



26,448 



26,448 



400 



46,284 800 



26,448 



Stephonodiscus 



400 



