58 



DISCOVERY REPORTS 



water was found, and that the Prince Olaf Hne, on which the mixing of Bellingshausen 

 with old eastern Weddell Sea type water was not much in evidence, was worked in the 

 interim. For the first part of these two lines the wind was mainly light and from the 

 south, but half-way out on the Prince Olaf line it backed to the west and blew hard, and 

 continued to do so while the outer stations on the Larsen line were being worked. It is 

 just possible that this caused a strong flow of Bellingshausen Sea water across from the 



Fig. 27. The distribution of Eucampia antarctica. South Georgia survey, November 1930. i = one hundred 



thousand. 



neighbourhood of the Shag Rocks to the station in question. Unless one presupposes 

 the existence of some comparatively rapid surface current of this nature, the high surface 

 temperature and peculiar nature of the phytoplankton at St. 493 remain inexplicable ; 

 surface temperatures were much lower, and A^. seriata rare or absent, at the stations 

 on the Prince Olaf line immediately to the westward. 



Eucampia antarctica was another form which reached its maximum in the water of 

 western Weddell Sea origin to the south of the island at this time, where, as will be seen 

 from Fig. 27, it was particularly numerous close inshore. Small numbers of this species 



