1920] 



Allen: Plankton of the San Joaquin River 



213 



1913 



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 

 11/ 1 

 11/ 8 

 11/15 

 11/22 

 11/30 

 12/ 6 

 12/14 

 12/20 

 12/27 



158,688 



264,480 



423,168 



317,376 



740,544 



317,376 



423,168 



52S.960 



423,168 



317,376 



211,584 



158,688 



211,584 



105,792 



158,688 



52,896 



79,344 



1,600 



52,896 



1,100 



12,800 

 6,400 



12,800 



3,200 

 528,960 



211,584 



Table 2. — Organisms Per Cubic Meter in Plankton of 

 San Joaquin River in 1913 — (Continued) 



lomonas Volvox Total Amoeba Amoeba Arcella 



Mastigophora proteus radiosa vulgaris 



2,696,000 



3.029,366 

 2,035,748 

 3,644,928 

 3,622,528 

 4,664,256 

 5,491,600 



3,436,544 



4,902,032 



7,761,216 



5,959,952 



8,780,736 



8,581,952 



4,157,280 



3,438,240 



4,281,184 



7,096,616 3,200 



4,446,464 



5,277,552 



2,996,624 



2,310,576 



796,640 



211,584 



105,792 



I -j sou 

 52;S96 



1,600 



Cyphoderii 

 ampulla 



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 

 i /21 

 6/28 

 7/ 5 

 7/12 

 7/19 

 7/26 

 8/ 2 

 8/ 9 

 8/15 

 8/23 

 8/31 



52.896 



12,800 



3,200 



6,400 

 12,800 



400 

 1,600 

 1,600 

 12,800 

 19,200 

 3,200 

 9,600 



6,400 



6,400 



79,344 



32,000 



19,200 



6,400 



634,752 



793,440 



15S.6.S.S 



211,584 

 185,136 

 158,688 

 132,240 



12,800 

 6,400 



"19,200 



105,792 



79,344 



1,600 



15N.0SS 



158,688 



Total 

 Rhizopoda 



400 



1,600 



1,600 



12.S00 



98,544 



4,800 



12,800 



3,200 105,792 



• 158.68S 



317,376 211,581 



1.600 

 3,200 



16,000 



8,000 



132,240 



88,096 



22,400 



6,400 



634,752 



104,944 



158,688 



211,584 



189,936 



158,688 



146,640 



3,200 



171,488 



168,288 



3,200 



131,392 



1,189,312 



647,552 



