1920] 



Allen: Plankton uf the San Joaquin River 



22;- 



Table 2. — Organisms Per Cubic Meter in Plankton of 

 San Joaquin River in 1913 — (Continued) 



Polyarthra 



Notholca Polyarthra trigla egg, 



1913 striata trigla attached female 



9/ 6 317,376 



9/13 51,200 



9/20 12,800 38,400 



9/27 12,800 12,800 



10/ 4 25,600 



lO/U 



10/18 12,800 76,800 



10/26 25,600 



11/ 1 



11/ 8 



11/15 



11/22 3,200 52,896 



11/30 25,600 



12/ 6 41,600 



12/14 105,792 3,200 



12/20 52,896 



12/27 3,200 



Trichocerca Trichotria Total 



1913 iernis curta Ploima 



1/ 5 5,200 



1/12 15,600 



1/19 27,436 



1/25 45,060 



2/2 .... 73,600 



2/ 8 308.240 



2/15 516,816 



2/23 380,144 



3/ 1 168,000 



3/ 8 937,632 



3/15 737,152 



3/23 1,022,432 



3/29 733,952 



4/ 5 403,024 



4/13 286,032 



4/19 1,106,768 



4/26 293,1,84 



5/ 3 100,144 



5/10 147,200 



5/17 1.50,.592 



5/24 200,888 



5/31 182,592 



6/7 208,192 



6/16 277,088 



6/21 464,672 



6/28 687,168 



7/ 5 12,800 3,200 1,002,480 



7/12 79,344 3,573,584 



7/19 12,800 1,297,728 



7/26 105,792 560,768 



8/ 2 38,400 1,213,216 



8/ 9 19.200 6,400 579,968 



8/15 44,800 1,378,112 



8/23 1.58,688 782,052 



8/31 105,792 1,573,312 



9/ 6 1,067,328 



9/13 76,800 1,441,920 



9/20 211,584 90.3,5.52 



9/27 128,000 685,184 



10/ 4 64,000 794,368 



Polyarthra 



trigla egg. 



attached male 



211,584 



1,600 



Synchaeta 

 sp. 



12,800 



115,200 



320,000 



264,480 



317,376 



51,200 



52,896 



22,400 



79,344 



79,344 



105,792 



79,344 



Total Bosmina 



Rotifera longirostris 



7,200 



20,000 



81,532 



80,308 800 



197,392 



38.5,040 



5.32,816 



472,288 



201,600 



1,070,528 



826,096 



1,210,768 



769,.5.52 



419,024 



2,87,232 



1,113,168 



293,184 : . 



100,144 3,200 



169,600 



1.56,992 



206,688 



195,392 



220,992 



277,088 



467,872 , 



690,.368 



1.005,024 



3,578,384 3,200 



1,297.728 6,400 



567,168 



1,387,904 6,400 



.579,968 



1,690,400 38,400 



1,201,828 



1.810.496 12,800 



1,067,.328 



1,518,720 76,800 



1,179,136 51,200 



842,176 2.5,600 



1,220,160 12,800 



Trichocerca 

 capucina 



12,800 



12,800 

 211,584 



1,600 



Bosmina 

 sp. 



6,400 

 3,200 



1,600 



