PLANKTON OF THE GULF OF MAINE 



85 



with less than 70 cubic centimeters, and ranging from this down to traces too small 

 to measure. North of Cape Ann the general rule has been the closer to land in 

 summer the scantier the catch (fig. 38), while the coastal belt as a whole then sup- 



7(C 



Fig. 37.— Volumes of plankton, in cubic centimeters, below each square meter of the surface of the sea in February and 

 March, 1920, as calculated from the catches made in the vertical hauls. In the shaded area the volumes were uniformly 

 greater than 75 cubic centimeters. 



ports less zooplankton to the north and east of Cape Elizabeth than to the south and 

 west, with the Grand Manan Channel the most barren part of the open gulf. We 

 have no quantitative data from the immediate vicinity of the western coast of Nova 



