1920] 



Allen: Plankton of the San Joaquin River 



199 



Table 2. — Organisms Per Cubic Meter in Plankton of 



San Joaquin River in 1913 — (Continued) 



Actinastrum 

 hantzschii 

 1913 (large) 



4/19 26,448 

 4/26 52,896 



5/ 3 



5/10 



5/17 



5/24 



5/31 105,792 



6/ 7 



6/16 



6/21 105,792 



6/28 



7/ 5 



7/12 105,792 

 7/19 581,856 

 7/26 476,064 

 8/ 2 158,688 

 8/ 9 317,376 

 8/15 528,960 



8/23 1,533,984 



8/31 1,586,880 

 9/ 6 423,168 

 9/31 528,960 

 9/20 102,400 

 9/27 634,752 



10/ 4 1,163,712 

 10/11 740,544 

 10/18 64,000 

 10/26 51,200 

 11/1 25,600 



11/ 8 



11/15 



11/22 52,896 



11/30 



12/ 6 



12/14 



12/20 



12/27 



Richteriella 



1913 botryoides 



1/ 5 



1/12 



1/19 



1/25 



2/ 2 



2/ 8 



2/15 



2/23 



3/ 1 



3/ 8 



3/15 1,600 



3/23 



3/29 1,600 



4/ 5 



4/13 



4/19 



4/26 1,600 



5/ 3 



5/10 



5/17 



Coelastrum Pediastrum 



microporum boryanum 



79,344 



105,792 

 6,400 



3,200 



317,376 

 105,792 

 317,376 

 317,376 

 105,792 



105,792 



105,792 



52,896 

 52,896 



3,200 



9,600 



1,600 



3,200 



25,600 



6,400 



25,600 



158,688 



3,200 



158,688 



12,800 



25,600 



211,584 



105,792 



76,800 



51,200 



25,600 



12,800 



25,600 



158,688 



19,200 



6,400 



9,600 



6,400 



6,400 



Scenedesmus Scenedesmus 

 obliquus quadricauda 



400 



400 

 400 400 



400 



105,792 



52,896 



1,600 



1,600 12,800 



3,200 



3,200 



52,896 

 1,600 132,240 

 3,200 211,584 



1,600 



105,792 



1,600 



79,344 



Z'Z'Z'Z'. 3,200 



duplex 



132,240 



16,000 



1,600 



6,400 



6,400 



32,000 



132,240 



15S,6S8 



661,200 



1,322,400 



1,79N.404 



2,062,9 H 



899,232 



1.1 Si. OSS 



2,697,696 



2,433,216 



2,010,048 



2,327,424 



2, .-.39,00s 



1,692,672 



4,241,680 



4,866,432 



846,336 



1,163,712 



793,440 



476,004 



89,600 



79,344 



79,344 



19,200 



52,896 



12,800 



52,896 



Schroederia 



1,600 



1,600 



35,200 



12,800 



6,400 



105,792 



32,000 



476,064 



25,600 



528,960 



25,600 



38,400 



38,400 



2.-.. 000 



25,600 



211,584 



12,800 



52,896 



Raphidium 

 polymorpl.uin 



1,600 

 52,896 



105,792 



1,600 

 52,896 



3,200 



3,200 



108,992 



3,200 



317,376 



211,584 

 211,584 

 634,752 



528,960 



52,896 



105,792 

 1,600 



Stigeoclonium Total 



sp. Chlorophyceae 



2.S00 



1,600 

 29,648 

 21,036 



145,792 



164,896 



li 1,000 



201,136 

 73,600 



210,736 



427,968 



233,040 

 762,096 



121,792 



177,792 



240,232 



321,328 



3,200 9,600 



22,400 



