SEA- FISHERIES LABORATORY. 289 



followed with the eye on the table above and the 

 corresponding one in our last report. 



The summer minimum of Diatoms was unusually 

 well marked in 1914, when the average standard haul 

 fell in August to less than 400. In 1913 it was over 

 94,000. The autumnal increase, in 1914, to over 900,000 

 in October was much more marked than in the previous 

 year, when the maximum was 187,000, in September. 

 But, in fact, all the groups show larger numbers in the 

 autumn and winter months of 1914 than in the 

 corresponding months of 1913. 



There was a rather unusual temporary increase of 

 Copepoda in April (26,000, while May showed only 

 12,000), and apparently a sudden change from this 

 zooplankton to the phytoplankton took place at the end 

 of April. There was a large zooplankton haul (62'5 c.c.) 

 on April 27th, consisting chiefly of Copepoda, and an 

 equally large (70 c.c.) haul on April 30th, which was 

 almost a pure phytoplankton (Chaetoceras, Lauderia, 

 and Eucampia). 



Diatoms. 



There is nothing very remarkable to record in 

 connection with the occurrence of Diatoms in the Bay 

 plankton of 1914. The numbers first rose to over a 

 million on March 24th, had increased to over 15 millions 

 by April 30th, attained their maximum of 155,288,000 on 

 May Mli, then dropped to 11^ millions on May 7th, and 

 remained fairly high (ill the second week of July. Then 

 (nine the summer minimum. They began to increase 

 again at the end of September, and readied to between 

 one and two millions on October 9th, 15th, 18th, and 

 November 3rd. The maximum of over 155 millions on 

 May 4th is mainly composed of a single species, namely, 



