DISCOVERY REPORTS, VOL. XXIII 



PLATE I 



GO. 



,,,,.,'.,,/> •:./> . J ,'!'■• ,'r, I fr^'i-l ri I irfc 



•■ ' i ','.■ I ■ 



60 



30 



120 



150° 



V/ 180°E 



Estimated mean position of the Antarctic convergence. The mean northern limit of the pack-ice is the average 

 Lstimated mean po^s^i^^^ ice-edge for September reproduced from Mackintosh and Herdman (1940)- 



