1920] Allen: Plankton of the San Joaquin River 171 



Table 1. — Organisms Pes Cubic Meter in Plankton of 

 Stockton Channel in 1913 — (Continued) 



Prorodon Stentor Stentor Tintinnidium Trachelius Trichodina 



1913 sp. coeruleus niger fluviatile ovum pediculus 



1/ 5 S00 6,612 



1/ 8 400 1,200 



1/12 .... 1,200 2,000 



1/15 33,060 26,448 



1/19 52,896 39,672 



1/22 72,732 112,404 800 



1/26 . ... 132,240 515,736 



1/29 26,448 158,688 



2/ 2 33,060 



2/ 5 400 39,672 



2/ 8 11,200 



2/12 52.S96 1,600 66,120 



2/15 105,792 8,000 39,672 



2/19 S00 800 52,896 1,600 3,200 



2/23 66,120 1,600 105,792 1,600 



2/26 3,200 67,200 6,400 



3/ 1 105,792 12,800 158.688 9,600 



3/ 5 185,136 



3/ 8 3,200 158,688 1.600 



3/12 105,792 608,304 



3/15 16.000 35,200 a 



3/19 6,400 211,584 3,200 



3/23 3,200 6,400 238,032 



3/26 132,240 



3/29 1,600 79,344 3,200 



4/2 ... 6,400 22,400 



4/ 5 6,400 6.400 28,800 



4/ 9 .... 9,600 



4/13 6,400 6,400 



4/16 ' 105,792 3,200 



4/19 41,600 



4/23 6,400 54,400 



4/26 3,200 211,584 



4/30 3,200 19,200 



5/ 3 6,400 105,792 



5/7 25,600 



5/11 105,792 



5/14 



5/17 211,584 



5/21 



5/24 6,400 



5/27 



5/31 



6/ 3 



6/ 7 



6/11 



6/16 



6/18 



6/21 



6/25 



6/28 



7/ 3 



7/5 



7/ 9 



7/12 



7/16 



7/19 



7/23 



7/30 :::::::::::::: :::::::::::::::: :::::::::::::::: "105,792 



6,400 



