EUPHAUSIACEA 2I? 



December-January survey round South Georgia, 1926-7: 



St. 125 (N100H) 2 at 140 m. St. WS 30 (N 100 H) 160 at 134 m. 



(N 70 V) 2 at 500-250 m. (N 70 V) 2 at 500-250 m. 



St. 129 (N 100 H) 156 at 80-0 in. 1 a t 750-500 m. 



St. WS 2 6(NiooH) 18 at 96 m. St. WS 31 (N 100 H) 2 at 53 m. 



(N 70 V) 4 at 500-250 m. St. WS 38 (N 70 V) 1 at 500-250 m. 



2 at 750-0 m. St. WS 60 (N 100 H) 6 at 146 m. 



St. WS 29 (N 70 V) 4 at 500-250 m. St. WS 61 (N 100 H) 1 1 at 132 m. 



North-east coast, May 1927: 

 St. WS no (N 70 V) 3 at 1000-750 m. 



Between South Georgia and the Falkland Islands : 



St. 161 (N 70 V) 1 at 500-250 m. St. WS 69 (N 70 V) 2 at 250-100 m. 



St. WS 67 (N 70 V) 2 at 1000-300 m. 1 at 750-500 m. 



St. WS 69 (N 100 H) 19 at 146 m. St. WS 70 (N 100 H) 81 at 146 m. 



This distribution is shown in Fig. 94. 



Specimens of E. triacantha have been taken by the Valdivia, 1 National Antarctic 

 (Discovery), 2 Swedish Antarctic, 3 Gauss, 4 Norvegia 5 and Vikingen Expeditions, 

 but rarely in large numbers. It appears to have a distribution very similar to that of 

 E.frigida, i.e. being sub-Antarctic but extending into the Antarctic Zone although 

 not so far south as E. superba. 



From our observations it is seen that it often occurs below 250 m., and on one occasion 

 two specimens were taken below 750 m., but also it may occur in quite large numbers in 

 the cold surface layer but at night. This vertical migration is discussed and described on 

 p. 240. Our observations confirm Ruud in believing that it does not penetrate quite so 

 far south as E.frigida, all the large samples occurring in the north of the region. 



Euphausia vallentini, Stebbing. This species is characteristic of the warmer waters of 

 the sub-Antarctic Zone rather than those of the Antarctic Zone and was taken on the 

 oceanic lines towards and across the line of Antarctic Convergence ; nevertheless, it 

 occurred at a few stations off the coast of South Georgia in November, December and 

 March. 



From Tristan da Cunha to South Georgia, February 1926: 

 St. 8 (N 100 H) 17 at o-iom. St. n (N 70 V) 1331500-250111. 



St. 1 1 (N 70 V) 2 at 50-0 m. St. 12 (N 70 V) 3 at 500-250 m. 



9 at 100-50 m. 



South Georgia, March 1926: 



St. 36 (N 100 H) 51 at 5o(-o) m. St. 41^ (N 70 V) 1 at 100-50 m. 



4 at 9o(-o) m. 



South Georgia, November 1926: 

 St. WS 20 (N 100 H) 1 at 190 m. 



South Georgia, December 1926: 



St. 136 (N 100 H) 1 at 0-5 m. St. WS 30 (N 100 H) 4 at 67 m. 



(N 70 V) 1 at 50-0 m. 4 at 134 m. 



St. WS 26 (N 100 H) 5 at 192 m. St. WS 36 (N 70 V) 1 at 500-250 m. 



1 Illig (1930). 2 Tattersall (1908). 3 Hansen (1913). * Zimmer (1914). 5 Rustad (1930/j). ° Ruud (1932). 



