2 University of California Publications in Zoology [Vol.22 



PAGE 



Making and recording the count 23 



Computation and tabulation 24 



Identification of forms 24 



Estimation of silt 25 



The clogging of the net 26 



Volumetric data 26 



Organisms found in San Joaquin plankton 27 



Definitions 27 



Component forms 27 



The principal types of fresh water plankton 28 



Major groups of plankton 29 



Algae 29 



Zooplankton 29 



Totals of major groups 30 



Comparison with similar groups of Illinois forms 32 



Detailed discussion of statistics 33 



Algae 34 



Bacteriaceae 34 



Schizophyceae 34 



Discussion of species 35 



Chlorophyceae 38 



Discussion of species 40 



Bacillariaceae 46 



Discussion of species 49 



Conjugatae 62 



Discussion of species 63 



Chlorophyll bearing organisms and Mastigophora 64 



Protozoa 66 



Mastigophora 67 



Discussion of species 68 



Rhizopoda 75 



Discussion of species 75 



Heliozoa 78 



Discussion of species 78 



Ciliata 79 



Discussion of species 80 



Suctoria 85 



Rotifera 86 



Rhizota 87 



Discussion of species 87 



Bdelloida 88 



Discussion of species 88 



Ploima 90 



Discussion of species 91 



Scirtopoda 106 



Gastrotricha 106 



Entomostraca 106 



Cladocera 107 



Discussion of genera 108 



Ostracoda 108 



Copepoda 109 



