1920] 



Allen: Plankton of the San Joaquin River 



205 



1913 



11/ 1 



11/ 8 

 11/15 

 11/22 

 11/30 

 12/ 6 

 12/14 

 12/20 

 12/27 



Table 2. — Organisms Per Cubic Meter in Plankton op 

 San Joaquin River in 1913 — (Continued) 



Melosira 



granulata A 



(small) 



Melosira 

 varians 



211,584 

 105,792 

 12,800 

 19,200 

 52,896 

 79,344 

 52,896 

 12,800 

 423,168 



Navicula 

 affinis 



Navicula 

 alpestris 



158,688 



3,200 

 1,600 



6,400 

 3,200 



Navicula 

 bacillum 



52,896 



52,896 



1,600 



52,896 



132,240 



Navicula 

 didyma 



52,896 



Navicula 



1913 dubia 



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 3,200 



6/21 



6/28 



7/ 5 



7/12 



7/19 



7/26 



8/ 2 12,800 



8/ 9 



8/15 



8/23 158,688 



8/31 



9/ 6 



9/13 



9/20 



9/27 



10/ 4 



10/11 



10/18 



10/26 105,792 



11/ 1 



11/ 8 



11/15 



11/22 



Navicula 

 gracilis 



72,732 



158,688 



185,136 



105,792 



105,792 



132,240 



1,600 



423,168 



343,824 



264,480 



423,168 



317,376 



793,440 



581,856 



290,928 



661.200 



1,745,568 



1,586,880 



1,110,816 



1,216,608 



634,752 



132,240 



185,136 



264,480 



528,960 



423,168 



846,336 



793,440 



1,639,776 



2,750,592 



3,649,824 



3,596,928 



2,644,800 



1,798,464 



1,269,504 



846,336 



740,544 



1,481,088 



423,168 



423,168 



52,896 



211,584 



52,896 



185,136 



Navicula 

 sp. 



59,908 

 800 



13,224 



3,200 



1,600 



80,944 

 105,792 

 1,600 

 1,600 

 4,800 

 3,200 

 105,792 



3,200 



' 79,344 

 16,000 

 161,888 

 105,792 

 105,792 



4,800 

 3,200 



6,400 



105,792 



Navicula 

 viridis 



400 



800 



13,224 



1,200 



3,200 



3,200 



1,600 



6,400 



3,200 



6,400 



6,400 



6,400 



19,200 



6,400 



3,200 



3,200 



132,240 



185,130 



38,400 



158,688 



211,584 



96,000 



19,200 



3,200 



25,600 



3,200 



6,400 



19,200 



12,800 



3,200 



'i05,792 



""25,600 



"211,584 

 25,600 

 12,800 



"'25,600 



12,800 



6,400 



6,400 



Nitzschia Nitzschia 



acicularis angularis 



39,672 



39,672 



19,836 



59,508 400 



185,136 8,000 



52,896 6,400 



105,792 3,200 



,52,896 6,400 



52,896 3,200 



133,840 6,400 



105,792 9,600 



1,600 3,200 



264,480 3,200 



132,240 132,240 



80,944 



105,792 79,344 



608,304 3,200 



158,688 105,792 



52,896 79,344 



105,792 211,584 



264,480 32,000 



1,005,024 25,600 



1,216,608 64,000 



581,856 19,200 



528,960 9,600 



581,856 12,800 



370,272 



264,480 3,200 



740,544 



423,168 



476,064 



158,688 105,792 



317,376 



370,272 



846,336 



1,057,920 



634,752 



317,376 12,800 



317,376 



846,336 



634,752 



528,960 



423,168 



264,480 



105,792 



370,272 



52,896 



