102 University of California Publications in Zoology [Vol.22 



Recurrent pulses are quite prominent in the records for this form, 

 with culminations as follows : 



Keratella eggs, attached. 



Station I Station II Station III Daily Hourly 



Average 263,312 54,732 96,442 140,815 12,669 



Identification certain. No male eggs were recorded and no effort 

 was made to keep the species record separate for eggs. The desira- 

 bility of such separation was overlooked until too late ; hence, as 

 might be expected, the egg record shows the same characteristics as 

 the dominant species, i.e., A', quadrata at Station I, and A', cochlearis 

 at the other two stations. 



Keratella egg, free. 



Station I Station II Station III Daily Hourly 



Average 363,933 57,631 100,216 128,490 602,201 



Identification quite uncertain. The designation was probably cor- 

 rect in a large majority of the counts but there is enough uncertainty 

 to invalidate definite conclusions, so they are not offered. 



Lecane luna Mull. (CaUnjpna.) 



Station I Station II Station III Daily Hourly 



Average 10 677 251 



Identification uncertain. Recorded only four times at Stations I 

 and II in small numbers, and once at Station III. Probably adven- 

 titious. At any rate unimportant. 



Notholca striata Mull. 



Station I Station II Station III Daily Hourly 



Average 165 1,692 847 



Identification satisfactory. Count included a small number of 

 different forms most of which were considered varieties with perhaps 

 one or two other species. Only six catches at Station I at rather wide 

 intervals, in very small numbers and mostly in the first three months. 

 Occurrence at Station II in every month except December, seven 

 catches in first three months, one catch in each month thereafter up 



