112 University of California Publications in Zoology [Vol.22 



Other groups represented by only one or two forms or seen only 

 in fresh material are as follows: 



Chironomus larva. Twice, II. Plauarian. 



Oligochaetes. Three times, II. Statoblast of Pectinatella. (?) 



Nais (?) sp. Statoblast of Plumatella. (?) 



Oelosoma sp. Hydraehnida sp. Twice, II. 



Summarizing, it may be worth while to call particular attention 

 to the number of forms present at different stations in different 

 months, and to the proportional differences in numbers of organisms 

 at the three stations by months, as shown by the accompanying text 

 table. 



Text Table 6. — Numbers of Kinds of Planktonts by Stations and by Months 

 in 1913 



January February March April 



Stations I II III I II III I II III I II III 



Bacteriaceae 100101100000 



Schizophyceae 743743666778 



Chlorophyceae 763966888 13 98 



Bacillariaceae 24 28 18 22 28 28 26 34 38 27 37 33 



Conjugatae 633445164266 



Mastigophora 655 10 6 11 877769 



Rhizopoda 212323324554 



Heliozoa 000000131101 



Ciliata 13 2 3 17 5 9 18 7 10 16 8 8 



Suctoria 0000000010 



Rhizota 010000000000 



Bdelloida 3323223 3 2221 



Ploima 11 10 9 10 12 10 15 11 12 14 12 10 



Cladocera 1110 10 2 1 



Copepoda 111112211321 



Miscellaneous 14123203 2 111 



Total 83 69 51 89 73 82 92 91 96 98 90 91 



May June July August 



Stations I II III " I II III I II III I II III 



Bacteriaceae 110111101111 



Schizophyceae 9 5 6 10 7 10 S 10 11 12 14 14 



Chlorophyceae 10 8 8 11 8 7 11 9 10 10 10 9 



Bacillariaceae 25* 37 31 23 42 34 18 35 29 22 35 33 



Conjugatae 142445555566 



Mastigophora 10 7 9 9 9 11 10 12 14 15 13 10 



Rhizopoda 622433534657 



Heliozoa 10211234 3 44 3 



Ciliata 845333722855 



Suctoria 00000001102 2 



Rhizota 000000000121 



Bdelloida 2 2 2 2 2 13 3 13 3 2 



Ploima 16 9 15 16 15 13 16 20 16 15 16 16 



Cladocera 11110 12 12 2 3 3 



Copepoda 2 111111112 2 2 



Miscellaneous 150120111112 



Total 93 86 84 87 98 92 91 107 101 107 122 116 



