128 



DISCOVERY REPORTS 



in November. Of the warmest group only Euphausia triacantha was represented, and 

 all the coldest species were present except Haloptilus ocellatus. 



Late in January the 'William Scoresby' also sailed south-eastwards from South 

 Georgia and found that the ice had retreated to the northern end of the Sandwich group. 

 This ice was skirted to the eastward and was found to fall away to the south and dis- 

 appear. The ship steamed southwards for some 600 miles in open water and finally 

 reached more ice in the eastern part of the Weddell Sea (Fig. 44). At the stations taken 

 off the ice around the South Sandwich Islands the same "cold" plankton was taken, 

 though some warm-water species, particularly Euphausia frigida, were well represented 

 (see Table V, column 6). Farther south (WS 544-51) the cold-water species increased 



Fig. 43. Distribution of warm- and cold-water plankton in the eastern part of the Scotia Sea. 



The edge of the pack-ice is indicated. 



and the warm-water species almost vanished (see Table V, column 7). Haloptilus 

 ocellatus was taken here in exceptional numbers. These last stations were taken in an 

 area which is probably covered with pack-ice during the greater part of the year. 



In February the 'Discovery II' returned to the South Sandwich region, working 

 stations along the ice-edge between the South Orkney Islands and the Sandwich group. 

 These stations (618-29) are shown in Fig. 45. The ice here had retreated very little since 

 December (Fig. 43), but the plankton had changed to a much warmer type. None of 

 the very " cold " group was present but such warm- water species as Pareuchaeta, Pleuro- 

 mamma, and Euphausia frigida were included in the catches. As the ship approached the 

 South Sandwich Islands, however, signs of a "colder" plankton appeared. Vanadis 

 occurred at St. 624, and Diphyes antarctica at Sts. 625, 626, 628 and 629. At the same 

 time smaller numbers of Pareuchaeta and Pleuromamma were taken (see Fig. 45 and 



