1920] 



Allen: Plankton of the San Joaquin River 



221 



Table 2. — Organisms Per Cubic Meter in Plankton op 

 San Joaquin River in 1913 — {Continued) 



1913 



4/19 



4/26 



5/ 3 



5/10 



5/17 



5/24 



5/31 



6/ 7 



6/16 



6/21 



6/28 



7/ 5 



7/12 



7/19 



7/26 



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 



1913 



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 



Asplanchna Asplanchnopus 



brightwellii 



sp. 



6,400 

 3,200 



3,200 



Brachionus 



Brachionus 

 angularis 



6,400 

 3,200 



3,200 



6,400 

 3,200 

 3,200 



19,200 

 38,400 



12,800 



6,400 

 52,896 



3,200 

 3,200 



Brachionus 



Brachionus egg, attached egg, attached 

 capsuliflorus female male 



3,200 

 3,200 



400 

 19,200 

 41,666 



16,000 



12.800 



6,400 



52,896 



3,266 



105,792 

 6,400 



Brachionus 

 angularis 

 caudatus 



Brachionus 

 egg, free 

 female 



800 



4,000 



400 



800 



1,600 



3,200 



79,344 



6,400 



3,200 



6,400 



52,896 



52,896 



3,200 



3,200 



3,200 



Brachionus Brachionus 



budapestenensis calyciflorus 



1,600 



6,400 



6,400 



1,606 



Brachionus 

 patulus 



6,400 



1,600 



Brachionus 

 plicatilis 



400 



800 

 1,600 

 3 200 



3,200 

 3,200 

 3,200 

 6,400 

 3,200 



3,200 

 3,266 



