82 Univcrsitu of California Publications in Zoologij [Vol.22 



Holophrya sp. 



station I station II Station III Daily Hourly 



Average 109,11:? 76,816 10;?,778 140,641 870,497 



Identification very doubtful. This generic name was used as a 

 catchall for a number of forms that might be referred to it without 

 too great stretch of possibilities. They were usually too much de- 

 formed in preservation to give any definite clue to affinities. About all 

 that can be safely said is that the assemblage is favored by warmer 

 waters and stagnation, probably also by sewage. 



Paramoecium aurelia 0. F. Miill. 



station I Station II Station III Daily Hourly 

 Average 10,931 1,415 941 



Identification satisfactory. Loss through net probably heavy. Oc- 



curr-ence almost entirely limited to first two and last two months of 



the year. Hence distinctly a cold water form. Record at Station I 



fairly constant in periods mentioned, with a maxiiiuim in December. 



Numbers small and catches rare at Station II and III. Evidently 



does best in sewage, probably on account of quantities of bacteria for 



food. 



Paramoecium bursaria Focke. 



Station I Station II Station III Daily Hourly 

 Average 9,785 4,254 439 



Identification uncertain. Probably should be included with P. 



aurelia though there seemed to be some difference. Shows practically 



same characteristics of distribution as the former species, . 



Paramoecium caudalum Elirbg. 



Identification satisfactory. Although a few specimens of this 

 type were found six times at Station I and once at Station III, it was 

 probably not- worth while to attempt separation. They are too few 

 to signify much. 



Plcuronrma sp. 



station I Station II Station III Daily Hourly 



Average 5,402 3,052 16 



Identification doubtful. Recorded thus as nearest possibility. 

 Records indicate preference for sewage and cold water. 



Prorodon sp. 



station I Station II Station III Daily Hourly 



Average 7,379 677 4,243 206 492 



Identification uncertain. Occurrence almast entirely confined to 



first three months and last three months of the year, thus indicating 



the favorable influence of cold weather. Larger numbers at Station 



I were probably due to sewage. 



