80 University of California Publications in Zoology [Vol.22 



well with Kofoid's (1908) Illinois results and since the net error is 

 undoubtedly great, too much importance must not be attached to 

 such a suggestion. 



Whatever the truth may be concerning their distribution there 

 is no question that the Ciliata exert a very marked influence amongst 

 local planktonts, especially in Stockton Channel. The larger Ciliata 

 are quite conspicuous in the catches there in the colder months. 



Discussion op Species 



Askenasia elegans Bloch. 



Identification probable. Recorded only at Station I four times in 

 small numbers. Thought to have been positively recognized in fresh 

 material, however. 



Chilodon sp. 



Identification doubtful. Recorded four times at Station I and 

 twice at Station II in small numbers. 



Coleps hirtus Ehrbg. 



Station I Station II Station III Daily Hourly 

 Average 7,338 3,052 4,149 



Identification certain. Loss through net heavy. Probably also 

 overlooked in counting sometimes. Recorded ten times at Station I, 

 five of which came in December. Recorded twice at Station II and 

 once at Station III. Evidently favored by sewage and probably by 

 temperature below 15° C. 



Colpoda sp. 



Identification very doubtful. Recorded at Station I five times in 

 very small numbers, once at Stations II and III. 



Cyclidium sp. 



Station I Station II Station III Daily Hourly 



Average 29,530 10,234 6,286 24,414 



Identification unsatisfactory. Referred to this genus purely on 

 general resemblance to figures in reference books. No undulating 

 membrane was visible under conditions of counting. Apparently a 

 warm water form favored by sewage. Small percentage retained by 

 net. 



