DISTRIBUTION OF YOUNG STAGES OF EUPHAUSIA SUPERBA 137 



(8) East of South Georgia 



(a) Sts. WS 297-310, observations in pack-ice in October 1928. 



(b) Sts. 452-471, Cape Town-Bouvet-South Georgia in October 1930. 



(a) October 1928 (Sts. WS 297-310). 



At eight vertical stations made in the vicinity of pack-ice only six larvae were taken, three being 

 Furcilia 6, two adolescent and one undetermined. They were found at Sts. WS 297, WS 307 and 

 WS 310. The i-m. nets, however, give a better indication of the occurrence of these forms. 



(b) Cape Town-Bouvet Island-South Georgia, October 1930 (Sts. 452-471). 



St. 452 was the first south of the Antarctic convergence on the track between Cape Town and 

 Bouvet Island. No larvae were taken there in the vertical nets, and at the following stations only 

 E. superba of the previous year class were encountered. Here again the i-m. nets give a much better 

 idea of abundance. Larvae were obtained at Sts. 453 and 471 only. At the former station one adoles- 

 cent was taken in the surface net, and at the latter there were thirty-three Furcilia 6 and thirty-three 

 adolescents, again in the surface net. 



This section is important, if only in a negative manner, so far as younger stages are 

 concerned. The stations were all taken very early in the summer season and no eggs or 

 first season larvae were obtained. 



(9) The Weddell Sea, January-February 1931 

 (Sts. WS 534-561). Fig. 59 



A line of stations was made in January-February 1931 from South Georgia via the 

 Sandwich Islands into the Weddell Sea as far south as 68° 53'. There were twenty-eight 

 stations at eight of which vertical nets were fished. On the outward journey at St. 

 WS 534 and WS 540 respectively, east of South Georgia and the Sandwich Group, 

 Furcilia 6 and adolescents were taken in moderate quantity. On the return journey, at 

 St. WS 557, one damaged juvenile was taken. No larvae or eggs were found in the 

 Weddell Sea proper, and the i-m. nets bear out this scarcity. In these nets the juvenile 

 E. superba taken are entirely restricted to the northern stations, and are all of the pre- 

 vious year class. The numbers of E. superba in the 70-cm. vertical nets are as follows: 

 St. WS 534 ninety-six; St. WS 540 twenty-five; St. WS 557 one. 



Material obtained during the circumpolar cruise 



A general account of this cruise of the R.R.S. ' Discovery II ' is given by John (1934). 

 A series of voyages to and from the ice-edge on a course east-about from South Africa 

 to South America was made during the winter months, and the importance of these, so 

 far as the present investigation is concerned, is twofold. The observations were the first 

 made in the winter months, and they were made in regions of the Antarctic from which 

 we had not previously had plankton samples. John picked out the young E. superba and 

 sent them to me, together with valuable notes of the environmental conditions in which 

 the larvae were taken. I have also had access to the scientific reports sent by him to the 

 Discovery Committee. 



D .\IV 18 



