HYPOTHESIS OF ANIMAL EXCLUSION 



3iS 



over 500 m. — in each range of phosphate values. Such considerations would not in- 

 validate the correlations with the phosphate values, and so with phytoplankton, but 

 might indicate that the depth of water below the phytoplankton zone was indeed such a 

 factor as that which we had conceived might be making a large number of zooplankton 

 organisms appear to be combining together to keep a check on the phytoplankton. 



Table LXI 



Showing the average numbers of the more important macroplankton organisms taken in the 

 series of three N 100 H nets at each daylight station; the stations being arranged in 

 order of decreasing soundings from deep to shallow water 



* Bottom not reached. 



In Tables LXI to LXIV are shown the average numbers of the more important 

 macroplankton organisms taken in the series of three N 100 H nets, and of the smaller 

 animals taken per 50 m. haul in the top 250 m. in the N 70 V nets, arranged in order of 

 decreasing soundings ; each is divided into two series of stations, those taken in daylight 

 and those taken at night. In the daylight macroplankton series, Table LXI, we have 

 only six deep-water stations (i.e. over 500 m.), and out of the six more important 

 organisms shown only Salpa and Limacina show notably more frequent occurrence over 



