Plate B 







A.- 



Fig. 1. Diatom Plankton, consisting 

 mainly of Rhizosolenia semispina. 



Fig. 2 Diatom Plankton, consisting 

 mainly of Thalassiosira nordenskioldii . 



Fig. 3. (Jopepod Plankton, consisting mainly 

 of Acartia discaudata. One Temora is seen. 



Fig. 4. Copepod Plankton, consisting 

 wholly of Calanus helgolandicus, 



