Bigelow. — Explorations in the Gulf of Maine. 



PLATE 8. 



Distribution of microplankton, July and August, 1912. 

 Abundant Ceratium plankton. * 



Intermediate Ceratium plankton. 

 Scanty Ceratium plankton. 

 Mixed plankton. 

 Scanty mixed plankton. 

 Abundant diatom plankton. |||| 

 Intermediate diatom plankton. 

 Scanty diatom plankton. v ' 



