SEA-FISHERIE& LABORATORY. 



377 



in April and May, when all the generic groups are well 

 represented, then diminishing to a summer minimum in 

 August — and so on. 



DlNOFLAGELLATA. 



The monthly averages for Cerath 

 in 1913 were as follows : — 



and Peridinium 



1913. 



Ceratium 

 tripos. 



Peridinium 

 spp. 



1913. 



1 



Ceratium 

 tripos. 



Peridinium 

 spp. 



January 



February . . . 

 March 



607 



■ 1,933 



4,170 



3,744 



5,367 



67,375 



15 



57 



12 



532 



23,278 



25,275 



J ul y ■••/ 



! August 



September 

 October 

 November... 

 December 



124,930 



67,577 



6,720 



526 



5,530 



5,167 



9,700 



673 



19 



April 



31 



May 



7 



June 



12 



The numbers for Ceratium tripos are much higher than 

 we have ever had them before, and the maximum is later 

 than in the last two years, being in 1913 in the latter 

 half of July. There were present 225,200 on July 21st, 

 and 239,000 on the 31st, and the numbers continued to be 

 in tens of thousands till almost the end of August. 



The actual maximum for Peridinium is 100,300 on 

 May 26th, which is a high record as compared with most 

 years, last year's maximum of over 8J millions being quite 

 unusual, and due probably to an exceptional inflow of 

 Atlantic water in the summer of 1912, bringing various 

 oceanic organisms in increased numbers into our coastal 

 waters. 



Noctiluca. 



Noctiluca miliar is is represented in our nets during 

 most months of the year 1913, July and December being 

 the two exceptions. There is one haul of 2,000 on 

 August 4th, but the next largest is only 900 



