206 



University of California Publications in Zoology [Vol.22 



Table 2. — Organisms Per Cubic Meter in Plankton of 

 San Joaquin River in 1913 — {Continued) 



Navicula 



1913 dubia 



11/30 



12/ 6 



12/14 



12/20 



12/27 



Nitzschia 



1913 sigma 



1/ 5 



1/12 



1/19 



1/25 



2/ 2 



2/ 8 1,600 



2/15 



2/23 



3/1 



3/ 8 



3/15 



3/23 



3/29 



4/ 5 



4/13 



4/19 



4/26 6,400 



5/ 3 3,200 



5/10 52,896 



5/17 211,584 



5/24 3,200 



5/31 317,376 



6/ 7 317,376 



6/16 6,400 



6/21 3,200 



6/28 3,200 



7/5 



7/12 



7/19 



7/26 



8/ 2 6,400 



8/ 9 105,792 



8/15 105,792 



8/23 211,584 



8/31 105,792 



9/ 6 105,792 



9/13 105,792 



9/20 105,792 



9/27 105,792 



10/ 4 317,376 



10/11 



10/18 12,800 



10/26 



11/ 1 



11/ 8 



11/15 



11/22 3,200 



11/30 3,200 



12/ 6 1,600 



12/14 3,200 



12/20 3,200 



12/27 3,200 



gracilis 



476,064 

 390,720 



Nitzschia Nitzschia 



acicularis angularis 



52,896 



79,344 



158,688 



1,600 



52,896 



Pleurostauron Rhopalodia 



parvulum gibba 



238,032 



145,464 



238,032 



522,348 



396,720 



476,064 



423,168 



238,032 



264,480 



502,512 



317,376 



476,064 



581,856 



343,824 



502,512 



132,240 



661,200 



449,616 



132,240 



687,648 



793,440 



1,216,608 



793,440 



211,584 6,400 



79,344 3,200 



1,600 



1,600 



132,240 



3,200 



264,480 



105,792 



105J792 ZZZZZZZ.'. 



105,792 



317,376 



211,584 



317,376 



105,792 



12,800 



52,896 



2,896 



52,896 



158,688 



132,240 



52,896 



238,032 



158,688 



211,584 



