140 



DISCOVERY REPORTS 



Fig. 1 1). Among these the plankton did not show very much fluctuation, but they cover 

 a small area and are not very illuminating. Sts. 360-2 (Fig. 12) are also close together, 

 but the proportions of the various copepods vary sharply, though some of the other 

 species are a little more uniform. The samples from Sts. 528 and 530 (Fig. 14) are quite 

 similar except that about eight times as many Calanus acutus were taken at the former 

 as at the latter. It seems then that on the occasions on which these regions have been 

 visited the most variable plankton existed to the east of the Sandwich group, while there 

 was a slightly less variable plankton between the Sandwich group and South Georgia. 



The line of stations taken in October 1930-1 from Bouvet Island to South Georgia 

 (Sts. 459-72, Fig. 14 and inset B) does not appear to cross any faunistic boundary. It is 

 curious that although these stations are mostly in the "old" Weddell Sea water, which 

 has presumably drifted up from the region of fluctuating plankton, the samples at each 

 of them show a remarkable similarity. There are differences, described on p. 127, 

 in the occurrence of certain cold-water species, but the distribution of the numerically 

 important species along this line is very uniform. Thus Calamis propinquus was the 

 dominant copepod at every station, Euphausia frigida was well represented throughout, 

 Limacina balea was numerous at most stations, the occurrence of Thysanoessa was 

 uniform and other species occurred mostly in small numbers. Only Euphausia superba 

 had an irregular distribution. 



The eastern part of the Scotia Sea, that is, the triangle formed by the South 

 Sandwich Islands, South Georgia and the South Orkneys, also contains water from the 

 Weddell Sea. Three lines of stations have been worked across this region: Sts. 372-5 

 in March 1929-30 (Fig. 12), 530-3 in December 1930-1 (Fig. 14), and 618-25 m 

 February 1930-1 (Fig. 14). The latter two lines followed the edge of the pack-ice. The 

 numbers of the numerically important species at these three lines of stations are shown 

 in Table X, which is arranged on the same plan as Table IX on p. 138. 



Table X. Eastern Scotia Sea 



