86 



BULLETIN OF THE BUREAU OF FISHERIES 



9 



O 



7T 



Fig. 38.— Volumes (cubic centimeters) of animal plankton below each square meter of the surface of the Gulf of Maine in 

 summer, as calculated from the vertical hauls made in 1912-1916. 0, 100 cubic centimeters or more per square meter; 

 ©, 50 to 100 cubic centimeters or more per square meter; O. 50 cubic centimeters or less per square meter; A, stations 

 where horizontal hauls showed an abundant plankton, but where no vertical hauls were made. 



The hatched curve includes areas where we have usually found more than 100 cubic centimeters per square meter; 

 the stippled curve where the catches have usually been less than 50 cubic centimeters per square meter. 



