BiGELow.— Explorations in the Gulf of Maine. 
PLATE 8. 
Distribution of microplankton, July and August, 1912. 
Abundant Ceratium plankton. Y 
: Yy 
Intermediate Ceratium plankton. YY, 
Z 
Scanty Ceratium plankton. Oy 
Mixed plankton. A 
SS 
Seanty mixed plankton. | | | | | 
Abundant diatom plankton. 
Intermediate diatom plankton. WN 
\ 
Seanty diatom plankton. SS 
