112 



Univcrsitij of California Publications in Zoolorjn [Vol.22 



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

 in fresh material are as follows: 



t'liironoiiius larva. Twice, II. 

 Oligochaetes. Three times, II. 



Nais (?) sp. 

 Oelosoma ap. 



Plauariaii. 



Statoblast of Pectinatella. (?) 

 Statoblast of Plumatella. (?) 

 Hydrachniila sp. Twice, H. 



Snmmarizinp:, it nniy he worth while to eall partienlar attention 

 to the nnmher of forms present at different .stations in different 

 months, and to the proportional differences in numbers of orgaui.sms 

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

 table. 



Text Table 6. — Numbebs op Kinds of Planktonts by St.\tions and by Months 



IN 1913 

 January February March April 



Stations I H OI^ I 71 HI ^ I 11 III I II III 



Bacteriaceae 10 10 1 10 



Schizophyceae 74 3 74 3 66677S 



Chlorophyceae 763966888 13 98 



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



Conjugatae 6 3 3 4 4 5 16 4 2 6 



Mastigophora 6 5 .5 10 6 11 8 7 7 7 6 9 



Rhizopoda 2 12 3 2 3 3 2 4 .5 5 4 



Heliozoa 000000131101 



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



Suctoria 0000 000010 



Rhizota 010 000000000 



Bdelloida 3 3 2 3 2 2 3 3 2 2 2 1 



Ploima 11 10 9 10 12 10 1.5 11 12 14 12 10 



Cladocera 111000001021 



Copepoda 111112 2 113 2 1 



Miscellaneous 141232032111 



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



May 



June 



July 



August 



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



Bacteriaceae 110111101111 



Schizophyceae 9 5 6 10 7 10 8 10 11 12 14 14 



Chlorojihyceae 10 8 8 11 8 7 11 9 10 10 10 9 



Bacillariaccae 25 37 31 23 42 34 18 35 29 22 35 33 



Conjugatae 142445 5 55566 



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



Rhizopoda 6224 3 3 534657 



Heliozoa 10 2 112 3 4 3 4 4 3 



Ciliata 84533 3 722855 



Suctoria 110 2 2 



Rhizota 12 1 



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 15 12 111112 



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



