34 



DISCOVERY REPORTS 



seen from Fig. 14 that this small haul was the only one in which Thalassiothrix was 

 taken off the south-west side of the island. 



Of the two dinoflagellates, Peridinium was more important than Ceratitim except at 

 St. 340, close in to the land, and throughout the survey, with a few notable exceptions, 

 Peridinium was as a general rule slightly the more numerous of the two. 



The Cooper Island line (Table VII, Figs. 4, 10) trended away to the south-east, 



PHYTDPLANKTON TOTALS 

 MILLIONS 





 °/ 

 40- 



400000 



200000- 



yZ^^^777//////////. 



CERATIUM PENTAGONUM 



F. GRANDIS 



Fig. 8. Diagram showing the 

 percentages of the principal 

 species in the catches on the 

 Cape Nuiiez Line, South 

 Georgia survey, January- 

 February 1930. 



Fig. 9. Diagram showing the 

 percentages of the principal 

 species in the catches on the 

 Undine South Line, South 

 Georgia survey, January- 

 February 1930. 



Fig. 10. Diagram showing the 

 percentages of the principal 

 species in the catches on the 

 Cooper Island Line, South 

 Georgia survey, January- 

 February 1930. 



and was therefore likely to cut into surface water of Weddell Sea origin, as distinct from 

 that of Bellingshausen Sea or mixed origin which probably extended over most of the 

 stations to the west and north of the island on this particular survey. The probable 

 sources of the various types of surface water met with round South Georgia have already 

 been briefly discussed (p. 8), and, as stated, the Weddell Sea water is generally 

 speaking richer in phytoplankton than the surface water derived from the Bellings- 

 hausen Sea. Accordingly we should expect to find that the samples taken at the outer 



