■24 



PROCEEDINGS OF THE 



extent the genera, that form the autumn increase (Chcetoceros 

 subtile and species of BMzosolenia) are quite different from those 



Fig. 2. — Distribution throughout the year — diagijammatic. 

 Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. 



present in spring (e. g., Chcetoceros contortum, and species of Tha- 

 lassiosira). 



From the list of the total plankton throughout the year, reduced 



DworuKCUinis 



PORT E.RIN PLANKTON 1907 NLWCRICAL PROPORTION OF SOMt CROUPS 



to the average per net per day, it is seen that the greatest bulk of 

 plankton in the water is in April, when the total catches in the 



