314 



BULLETIN": MlSF:rM OF COMPARATIVE ZOOLOGY. 



Average 115 



1.1 



From May to June the amount of macroplankton present increased 

 oflF Matinicus and over the northern part of the Eastern Basin, de- 

 creased in the Western Basin, a change resulting in much the same 

 conditions as in August 1914. But in September, as in May, plankton 

 was most abundant in the sink north of Cape Ann, and again over the 

 Eastern Basin; with a band of decidedly barren water all along the 

 coast of Maine from Cape Elizabeth to Grand Manan Channel. The 

 average volume of plankton, both per square and per cubic meter was 

 greatest in May (181; and 1.5 cc. respectively), least in June (80 cc. 

 and .4 cc), with the September volumes intermediate (145 cc. ; and 

 about 1 cc); and in that month the richest haul was made (425 cc. 



