306 



DISCOVERY REPORTS 



Table LVII 



Correlations of phosphate values and the average numbers of the more important plankton 

 organisms taken in N 70 V nets for the top 250 m., expressed as averages per 50 m. hanl 



a Omitting one outstanding high catch of 1468 at St. WS 45. 

 " „ „ „ „ 129 at St. 136. 



7i at St. WS 45. 



nets, at the end of their tow before being hauled to the surface. As in dealing with the 

 N 100 H nets, we will take the total numbers of each organism taken at each station in 

 the three nets. The stations are arranged and averaged in groups of the same ranges of 

 phosphate values as before. The samples obtained by these nets were analysed by the 

 late Mr Andrew Scott, who was particularly interested in the Copepoda. The only 

 organisms he identified specifically other than copepods were the amphipods Para- 

 themisto gaudichaudi and Salpa fusiformis; these, together with Euphausia spp. adults 

 and Euphausia spp. larvae are included with the Copepoda in Table LVIII. We will 

 take the Copepoda first. Here we see a striking confirmation of the three categories 

 suggested in the N 70 V net results. All those of Group A conform to the principle. 

 Those of Group B show little or no correlation, and Calanus simillimus and Drepanopus 

 pectinatus in Group C show the same relation to the phosphate values (and so to the 



