DISCOVERY REPORTS 



was encountered on passage to the northernmost of the South Sandwich Islands, with 

 Chaetoceros criophilum dominant and Rhizosolenia stylifonnis the most abundant of the 

 other forms present. The surface water in this area should undoubtedly be regarded as 

 of the comparatively old eastern Weddell Sea type. Around the western fringes of 



60 



es 



30° 



>v 



20 





■^J?m 



SCALE 



I < 1.000,000 



■ 1.000,000-iQooaooo 



B lO.OOD.QOO - 50.000,000 



150000,000-100,000,000 



> 100,000,000 



30° 



60 



^nflTiiiri'iii" 



20° 



65 



Fig. 47. Distribution of phytoplankton (totals per loo-o m. haul) in the eastern Weddell 



Sea, January-February 193 1. 



the pack-ice encountered in the neighbourhood of the South Sandwich Islands the 

 catches were much smaller, and here Corethron valdivioe was dominant. A further 

 development of this phytoplankton, with the other forms becoming more and more 

 subservient to Corethron, is known to have persisted in this area for a considerable time 

 after this pack-ice had cleared away. In skirting the pack-ice to the east yet another type 



