SI 8 DISCOVERY REPORTS 



Chaetognatha, Ostracoda, Amphipoda, the pteropods Limacina and Clio, and young 



fish occurred in small numbers along the roll. 



Records 4 and 5 



Date: 25-26. i. 26. 



Time: 11 17-1830 and 1845-1730. 



Position: 31 07' S, 3 29' W to 31 32' S, 6° 40' W (approx.). 



Distances by ship's log: 43-3 and 120 (approx.) miles. 



RECORD 4 

 l°] DIPHYIDAE 



oJ 



RECORD 5. 



10] EUPHAUSIACEA JUV. 

 1----- --■• '■ 



5-1 EUPHAU5IACEA AD 



Q±. -.-.-- 



I I . I . . 1. ill-l.l- 

 i.ll.l ..... 



.I.i.l 



Fig. 5. Variations in the numbers of the predominant plankton organisms on Records 4 and 5 taken over 

 distances of 43-3 and 120 (approx.) miles respectively. A time scale (blacked in triangles) is provided below 

 the graphs. 



Record 6 

 Date: 26-27. i. 26. 

 Time: 1855- 1800. 



Position: 31 32' S, 6° 40' W to 32 56' S, 8° 37' W. 

 Distance by ship's log: 121-1 miles. 



These three records, 4, 5 and 6, form a continuous series in the South Atlantic to the 

 north-east of Tristan da Cunha. Record 6, which was badly preserved, will be dealt with 

 separately. Fig. 5 shows the fluctuations in the more important forms on Records 4 

 and 5 : Diphyidae, Chaetognatha, Copepoda, Euphausiacea and their larvae. We may 

 note the small concentration of Diphyidae, the larger numbers of Copepoda taken 

 between 1700 and 1800 and between 0700 and 0900, and the larger numbers of 

 Euphausiacea taken at night, no doubt due to vertical migration. 



Record 6 was a trial made without using the covering roll soaked in formalin, and it 

 was found that the majority of organisms were decomposed beyond recognition and a 

 quantitative estimate was impossible. The Euphausiacea and their larvae, however, 

 could be counted and are shown in Fig. 6, together with a very rough indication ol the 



