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BULLETIN OF THE BUREAU OF FISHERIES 



theless, the average numbers per square meter, calculated by months, for the seasons 

 of 1913, 1915, and 1920 combined (fig. 79), are consistent enough to suggest, though 

 hardly to prove, that on the whole M. lucens is at a low ebb numerically at the end 

 of the winter, but that its numbers increase during March, April, and May. 



Fig. 79.— Metridia lucens. Average numbers per square meter of sea area taken in the vertical hauls, by months, (or all the 



years and stations combined 



Off Gloucester the number rose from nothing on March 1 , 1920 (station 20050) , to 

 150 per square meter on April 9 (station 20098) and to 16,500 in one haul on May 4, 

 but only 252 in another, as just noted. Off the Isles of Shoals the increase was from 

 none on March 5 (station 20061) to 1,500 per square meter on April 9 (station 20093). 



