258 
BULLETIN OF THE BUREAU OF FISHERIES 
theless, the average numbers per square meter, calculated by months, for the seasons 
ofJ|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, for 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). 
