MATERIAL AND METHODS 169 



(7) The 30° Line (Text-fig. 1). 



During March, April and May of 193 1 collections were made along the meridian of 30 W., from 

 57 36' S. to 14 27J N., in four hydrological zones, at Sts. 661-99. Catches were made at various 

 depths down to 3000 m. with the TYFB and TYFV nets. 



(8) Falkland Islands to Cape Town (Text-fig. 1). 



In May and June 1926 collections near the Sub-Tropical Convergence were made at Sts. 71, 72, 

 74, 78, 85, 87 and 89 with the N 70 V and TYF nets. Part of this line, from Tristan da Cunha to 

 Cape Town, was repeated in June 1927 (Sts. 250, 254, 256, 257, 258 and 259), with shallow TYF nets. 



(9) Cape Verde Islands to and from Cape Town (Text-fig. 1). 

 Some of these stations extend the lines noted above. 



(a) July to August 1927: Sts. 266, 267, 268, 270, 273, 276, 282, 287, 288, 289, 291 and 294; only 

 samples from TYF nets, towed near the surface, examined. 



(b) October to November 1935, Sts. 1592, 1594, 1596, 1598, 1600, 1602, 1604, 1606; samples 

 from TYFB nets towed at various depths between 700 m. and the surface. 



(c) April to May 1937, Sts. 2028-66; samples from N 70 B, N 100 H, TYFB, N 450 B and 

 N 450 H nets towed at various depths. 



(d) October to November 1937, Sts. 2073-84; samples from TYFB nets towed at the surface and 

 at depth. 



(e) March to April 1939, Sts. 2627-48; samples from N 50 V and TYFB nets fished through the 

 surface layers and TYFB nets towed at depth. 



All these samples provide information on the distribution of species within the Sub-Tropical and 

 Tropical zones. 



(10) Cape Verde Islands to Falkland Islands (Text-fig. 1). 



During October and November 193 1 collections were made at Sts. 701-18, from depths varying 

 between 358 and 150 m. to the surface with the TYFB nets used once at each station. This is the 

 only line of stations in the western area of the South Atlantic. 



Specimens from the following miscellaneous stations have also been examined (Text-figs. 1 and 2). 



(11) Antarctic Zone. 



Sts. 12, 169, 373, 395, 461, 532, 535, 619, 813, 825, 1148, 1157, 1559, 1789, 1813, 1815, 1833, 

 1871, 1876, 1917, 1944, 1946, 1993, 1994, 1995, 2006, 2567, WS 200, WS472. 



(12) Sub-Antarctic Zone. 

 Sts. 1 88 1, WS408, WS411. 



(13) Sub-Tropical Zone. 

 Sts. 4, 1554, 1555. 



At the majority of these miscellaneous stations, single specimens of some of the larger species had 

 frequently been picked out of the samples and were preserved separately (Appendix II, Table;). 

 In addition some stations are from localities from which Monro (1930, 1936) reported material. 



Full use has been made of the Plankton Analysis Sheets prepared by the staff of the N.I.O., when 

 sorting the samples. These sheets summarize all the major phyto- and zooplankton groups collected. 

 As noted in the appendices, the nil-results for complete samples are taken directly from these Analyses 

 except when I did the sorting, for the negative results of which I am responsible. All these negative 



