236 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



DISCUSSION OF THE GROUPS. 



Turning now to the details of the various groups of 

 organisms in the different hauls throughout ihe year we 



have, first of all, taken out the numbers of these groups 

 from the lists day by day, dividing the totals by the 

 number of hauls of the nets made on that day, so as to 

 get results for each group, per day, per net. We have 

 treated in that way the Diatoms, the Dinoflagellates, the 

 Gopepoda, the Cladocera, and a few of the more prominent 

 single species such as Ceratium tripos, Sagitta bipunctata, 

 Tomopteris onisciformis, Oiho'pleura clioica, and some of 

 the Copepoda. 



Diatoms. 

 The variation in the total catch of Diatoms 

 throughout the year will be seen from the following list. 

 All the days upon which plankton gatherings were taken 

 are recorded, and the Diatoms from all nets on each day 

 are added together, the average per net for that day being 

 given in the last column. 



Jan. 8 



18 

 Feb. 5 



22 



26 

 Mar. 4 



26 



27 



29 



29 



Apr. 



ets. 



Total. 



Average per net, 



1 = 



5,650 



5,650 



1 = 



34,300 



34,300 



1 = 



152,600 



152,000 



1 = 



205,050 



205,050 



4 = 



293,900 



73,475 



3 = 



284,000 



94,666 



2 = 



220,000 



110,000 



1 = 



277,000 



277,000 



1 = 

 4 = 



326,000 [ 

 180,650 j "* 



101,330 



5 = 



425,000 ) 



118,500 



3 = 



523,000 J "" 





4 = 



1,000,000 



250,000 



1 = 



335,000 



335,000 



4 = 



5 = 



890,000 } 

 20,434,000 J "" 



2,369,333 



5 - 



17,669.000 



3,533,800 



2 = 



697,500 



348,750 



5 = 



12,362,000 ) 



1,720,600 



5 == 



4,844,000/ '" 





5 - 



1,249,000 ) 





5 - 



2 =-- 



696,000 I 

 159,000 f '" 



200,429 



2 = 



702,000 j 





