1920] Allen: Plankton of the San Joaquin River 31 



Text Table 1. — Total Planktonts by Major Groups 



Number Station I Number Station II 



forms Total Average forms Total Average 



Total Phytoplanktonts. 85 2,720,856,600 26,162,100 97 2,216,347,628 42,622 068 



Bacteriaceae 2 1,696,364 16,310 1 1,035,072 19,905 



Schizophyceae 15 160,755,148 1,603,414 IS 67,219,364 1 292 680 



Chlorophyceae 15 188,417,098 1,811,722 13 77,972,944 1 499 479 



Bacillariaceae 47 2,351,342,460 22,609,062 59 2,052,872,514 39.47S317 



Conjugatae 6 12,651,930 121,653 9 17,247,734 331.687 



Total Zooplanktonts ..... 141 1,102,116,740 10,597,272 110 229,332,166 4,410,230 



Mastigophora 25 3S5,691,226 3,708,569 20 136,713,846 2,629,112 



Rhizopoda 13 17,402,198 167,328 9 7,842,488 150,817 



Heliozoa 5 38,583,488 370,995 5 13,376,096 257,232 



Ciliata 29 98,463,242 946,762 16 23,291, 26S 447,909 



Suctoria 3 79,296 762 3 467,776 8,995 



Total Protozoa 75 540,219,450 5,194,416 53 181,691,474 3,494,065 



Rhizota 2 156,992 1,509 3 1,933,424 :,7 1M 



Bdelloida 6 36,328,460 349,312 6 2,449,472 47 105 



Ploima 47 467,115,946 4,491,499 34 41,559,652 799 224 



Total Rotifera 55 503,601,398 4,842,320 43 45,942,548 883,510 



Cladocera 3 400,992 3,855 4 384,000 7,384 



Copepoda 4 57,856,500 556,312 3 770,768 1 1.S22 



Total Entomostraca 7 58,257,492 560,167 7 1,154,768 22,206 



Miscellaneous 4 38,400 369 7 543,376 10,449 



Total planktonts 



enumerated 226 3,822,973,340 36,759,372 207 2,445,679,794 47,032,298 



Synthetic 3,104,857,862 29,854,420 2,352,026,402 45,231,275 



Analytic 718,115,478 6,904,952 93,653,392 1,801,023 



Text Table 1. — Total Planktonts by Major Groups — Continued 



Numher Station III Number Dail 



of 

 forms 



Total Phytoplanktonts. 93 



Bacteriaceae 1 



Schizophyceae 16 



Chlorophyceae 13 



Bacillariaceae 55 



Conjugatae 8 



Total Zooplanktonts 108 



Mastigophora 25 



Rhizopoda 11 



Heliozoa 4 



Ciliata 17 



Suctoria 2 



Total Protozoa 59 



Rhizota 3 



Bdelloida 3 



Ploima 33 



Total Rotifera 39 



Cladocera 3 



Copepoda 3 



Malacostraca 1 



Total Entomostraca 7 



Miscellaneous 3 



Total Planktonts 



enumerated 201 



Synthetic 



Analytic 



