1920] Allen: Plankton of the San Jo<iquin River 31 

 Text Table 1. — Total Planktonts by Major Groups 



Number Station I Number Station II 



of . ■ . of . ■ . 



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 15 166,755,148 1,603,414 18 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 39,478,317 



Conjugatae 6 12,051,930 121,653 9 17,247,734 331,687 



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



Mastigophora 25 385,691,226 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 2.57,232 



Ciliata 29 98,463,242 946,762 16 23,291,268 447,909 



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 37,181 



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 14,822 



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 — Conlinved 



Number Station III Number Daily 



of ■ . of ■ 



forms Total Average forms Total Average 



Total Phytoplanktonts. 93 2,090,812,294 40,996,318 53 1,018,801,028 32,864,549 



Bacteriaceae 1 116,992 2,294 1 11.5,392 3,722 



Schizophyceae 16 99,.840,742 1,957,661 12 80,.574,044 2,,599,163 



Chlorophyceae 13 91,241,112 1,789,041 11 67,560,712 2,179,378 



Bacillariaceae 55 1,878,169,822 36,826,859 25 869,719,232 28,0.55,459 



Conjugatae 8 21,443,626 420,463 4 831,648 26,827 



Total Zooplanktonts 108 2.53,1.53,822 4,963,800 61 335,441,120 10,820,681 



Mastigophora 25 134,216,822 2,631,702 14 .57,4.56,.320 1,8.53,429 



Rhizopoda 11 14,706,624 288,365 4 3,1.55,872 101,802 



Heliozoa 4 14,003,600 274,.5SO 2 19,193,826 619,156 



Ciliata 17 22,003,692 431,445 6 40,488,334 1,-306,075 



Suctoria 2 409,984 8,0.39 



Total Protozoa .59 185,340,722 3,634,131 26 120,294,3.52 3,880,462 



Rhizota 3 1,5.39,424 .30,185 



Bdelloida 3 2,897,100 .56,806 3 3,745,7.52 120,831 



Ploima 33 61,996,492 1,215,618 27 165,007,160 5,.322,812 



Total Rotifera 39 66,4.33,016 1,302.609 30 168,752,912 5,443,643 



Cladocera 3 469,040 9,197 2 2.30,400 7,4.32 



Copepoda 3 742,032 14,549 2 46,141,056 1,488,421 



Miilacostraca 1 20 



Total Entomostraca 7 1,211,092 23,746 4 46,371,456 1,495,853 



Miscellaneous 3 168,992 3,314 1 22,400 723 



Total Planktonts 



enumerated 201 2,343,966,116 45,960,118 114 1,354,242,148 43,685,230 



Synthetic 2,225,029,116 43,628,020 1,076,2.57,.348 34,717,978 



Analytic 118,9.37,000 2,332,098 277,984,800 8,967,252 



