DISTRIBUTION OF ANTARCTIC MACROPLANKTON 



83 



February). In March she repeated a line of the November survey off South Georgia (WS 567 75) 

 and the season's work was over. 



By the time the present paper was ready for publication the ' Discovery II ' had re- 

 turned from a second commission, and a large collection of new N 100 B samples was 



Fig. 15. Stations in Bransfield Strait, 1928-9. 



Fig. 16. Stations in Bransfield Strait, 1929-30. 



Fig. 17. Stations in Bransfield Strait, 1930-1. 



available, but it was thought desirable to publish some results of the four previous 

 seasons' work to avoid the delay which would be entailed if the new material was 

 incorporated with it. 



THE ANTARCTIC CONVERGENCE 

 The Antarctic convergence, which divides the Antarctic from the sub-Antarctic 

 surface waters, is an important faunistic boundary. In the period 1927-3 1 a number of 

 lines of stations crossed this convergence, and it is necessary first to determine which 

 of these stations lie in Antarctic and which in sub-Antarctic water. The Antarctic 

 convergence can be located by a sudden change in surface temperature and is usually 



3-2 



