60 



Pamela G. Jenkins 



the number of copepods in the column per square metre of surface, namely in 70 m^. (The amounts 

 of chlorophyll in the water column (Fig. 5) to be considered later were conducted in the same way.) 

 These totals were included because the phytoplankton and zooplankton crops are obviously 

 related. In 1951-52 some medusae were found but none could be seen in the following year. Nudi- 

 branch veligers were found from June to August, though not previously seen on the disks. 



Table I — Numbers of Copepods found on collodion membrances from April until August 



1953, in 2 litres of water at station E\ 



* See text, p. 59. 



Table II — Diatoms identified in enriched cultures exposed to light 

 Signs : — Not found A present B more frequent 



C plentiful D very plentiful O not found in one of the two cruises 



Where two letters occur for one month, two cruises were undertaken 



Bacillariophyceae 



Years 



J 



M 



M 



O N 



D 



COSCINODISCACEAE 



Coscinodiscus sp. 



C. concinnus 

 C. excentricus 

 C. radiatus 

 Melosira moniliformis 



Paralia sulcata 



Skeletonema costatum 



Thalassiosira sp. 



T. condensata 

 T. decipiens 



T. gravida 



T. nordenskioldii 

 T. subtilis 



Biddulphiaceae 

 Biddulphia sp. 

 B. regia 

 B. sinensis 

 Ditylum brightwellii 



Eucampia zoodiacus 



1952 

 1953 

 1952 

 1952 

 1952 

 1952 

 1953 

 1952 

 1953 

 1952 

 1953 

 1952 

 1953 

 1953 

 1952 

 1953 

 1952 

 1953 

 1953 

 1952 

 1953 



1952 

 1952 

 1952 

 1952 

 1953 

 1953 



B 



— A 



B 



B 



B D 



CO AO 



AO AO 



B — 



DO BO 



BO — 

 BO — 



— — — — A — 



— — — C — — 



— — — A — — 

 B — A B — — 



OB 



B 



A 



C 

 B 



B — C 



D — BO — 



— — — DO 



— — AO AO 



B — — — 



D 

 D 



B 

 D 



A 

 D 

 D 

 D 

 B 



B 

 D 



DD D 

 C D 



DD D 



B 



B 

 D 



D 

 D 



D 

 D 



__________A — 



__________A — 



— — — — — — — — B D C A 



A — — — — — — — — OD— — 



A ___________ 



