92 Umvcrsitu of Cnlifornui I'uhJiralioiis in Zoologii [Vol. 22 



Anuraeopsis sp. 



Stution I Station II Station HI Daily Hourly 



Average 8,230 308 4,619 26,867 



Identification doubtful. Record probably includes two or three 

 small forms with indistinct characteristics in tlie ])i'eserved condition. 

 Referred to this f^enus as the nearest probability. .May inclu(h> dis- 

 torted specimens of A. fissa. Since the only records of this form are 

 in June and July at the three stations, it may be that tlie wliolc num- 

 ber sliould be transferred to A. fissa. 



AsplancliiKi briijhtwclli Gosse. 



Station I Station II Station III Daily Hourly 



Average 16,892 308 533 43,192 2,954 



Species determination uncertain. Genus certain. Record prob- 

 ably includes at least two or three species under this heading, species 

 segregation being too ditfieult during the count. Eggs not counted. 



Occurrence at Station I regular from mid-March to November I. 

 Maximum, 158,688, on July 5 but almost equalled in April and Octo- 

 ber. Recorded only three times at Station II in April, June and 

 July in small numbers. Recorded five times at Station III from 

 March to November in small numbers and at wide intervals. Dis- 

 tinctly favored by sewage and by temperatures near 20° C. 



The record at Station I shows ten fairly distinct pulses, seven of 

 which followed pulses of chlorophyll bearing organisms by from three 

 to seven days, two of which coincided with such pulses, while one 

 preceded. The eon-elation of these pulses is far the most impressive 

 of any yet observed. The following table, text table 3, shows tem- 

 peratures and pulses: 



Text T.\ble 3 



April 9 18 132,240 April 26 20 41,600 



Mav 11 21 44,800 Mav 27 23 51,200 



Julie 7 25 44.800 Julv 5 26 158,688 



Aug. 2 26 44,800 Aug. 15 23.5 76,800 



Sept 13 25 51,200 Oct. 29 19 105,792 



Asplanchnopus sp. 



Identification doubtful. Recorded three times each at Stations I 

 and II and six times in hourly series at Station III. Not important. 



BrachioiiKS. 



Identification of the fenuiles of this genus was nearly always satis- 

 factory as to genus but the separation of species was frequently dif- 

 ficult and sometimes impossible. Males were never positively recog- 

 nized, hence species records were of females only. Eggs were easily 



