DISTRIBUTION OF PHYTOPLANKTON 6l 



Tropidoneis antarctica, Grun., was also only recorded in small numbers from two 

 stations: 161 and WS 33. 



Chlamidia antarctica, Karsten. A single specimen of this species was recorded at 

 St. 161. 



Fig- 3 1 • Distribution of Fragilaria antarctica round South Georgia in the December-January 1926-7 survey. 



For full explanation see legend of Fig. 16. 



Nitzschia. 



Nitzschia seriata, Cleve. This was one of the most abundant diatoms met with ; the 

 estimated number at WS 40 being 63,180,000. Its numbers and distribution are shown 

 in Appendix I, and Fig. 33 shows its distribution during the December-January survey, 

 1926-7. It is seen to occur on both sides of the island but to be particularly abundant 

 on the south-west side of the island where the waters of Weddell Sea and Bellingshausen 

 Sea origin meet, and where the latter meets the continental shelf of South Georgia. It 

 was present in small numbers in March 1926, at St. 23. It occurred to the westward 

 of South Georgia in February 1927, being taken in large numbers at Sts. 160, 161 and 

 WS 67, as shown in Fig. 34, but was not found beyond the Antarctic Convergence. 



