COPEPODA 123 



it at one station in 84 S. It was also taken in the Antarctic, but less frequently, by the 

 ' Gauss ' (Wolfenden, 1911). 



Whilst it is an Antarctic species it is not strictly limited to the Antarctic Zone. Between 

 South Georgia and the Falkland Islands it occurred in comparatively large numbers 

 between 250 and 50 m. at St. WS 69, which is well across the Convergence line witli 

 temperatures of 3-42° C. at 200 m., 4-23° C. at 100 m., and 6-79° C. at 60 m. At St. 70 

 it was limited to a small number between 500 and 250 m. depth at temperatures of 

 376 C. at 500 m. and 4-07° C. at 300 m. Between Tristan da Cunha and South Georgia 

 it was absent from Sts. 9 and 10, which are farther to the north in latitude 46 S. 



It was more or less evenly distributed immediately around South Georgia in water of 

 both Bellingshausen Sea and Weddell Sea origin ; Fig. 57 should be compared with 

 Fig. 6, particularly in regard to the "A" line to the north. In March 1926 it showed 

 a somewhat patchy distribution, as will be seen on reference to the Table in Appendix II, 

 Sts. 13-21 and 30-31. On account of this, the small numbers recorded and the limited 

 observations, it is impossible on the present data to gauge its seasonal distribution. 



Its mean vertical distribution compared with other species at deep-water stations is 

 shown in Fig. 55. Its vertical distribution at individual stations round South Georgia 

 and on the oceanic lines is shown in Figs. 58 and 59. The species was shown to exhibit 

 a marked diurnal vertical migration. This is discussed and illustrated in comparison with 

 other forms on pp. 233-235. 



Calanus minor, Claus. Only a single specimen, female, was taken in the warm inter- 

 mediate layer at a depth of 750-500 m. Temperature i-82-i-94° C; salinity 34-6- 

 34-69 °/ 00 . Not previously recorded in the Antarctic Zone. 



Calanus propinquus, Brady. The complete record of the occurrence of this species 

 is shown in Appendix II. It had a general but by no means even distribution through- 

 out the area. It was abundant in the open ocean. The average number per 50 m. 

 haul with the N 70 V net in the top 250 m. of water at the oceanic Sts. 9-12 (approaching 

 South Georgia from Tristan da Cunha) and Sts. 160, 161, WS 67-70 (between South 

 Georgia and the Falkland Islands) was 1082 ; whereas a similar average for stations round 

 South Georgia in the December-January survey, 1926-7, was only 50. It must be 

 remembered that the two oceanic lines were taken in February (1926 and 1927), and a 

 seasonal difference may to some extent account for the difference, but not altogether 

 (see below). This distribution is shown in Fig. 60. It is seen that round South 

 Georgia it was most abundant over the deeper water. Its range was unrestricted by the 

 line of Antarctic Convergence. On the line to the Falkland Islands the greatest number 

 was recorded in the top 50 m. at St. 70 across the line of Antarctic Convergence, Fig. 62 ; 

 and on the line from Tristan da Cunha the greatest number was recorded in the top 50 m. 

 at St. 1 1 south of the line of Antarctic Convergence. Round South Georgia it appeared 

 to be more abundant in the water of Weddell Sea origin, arriving from the east and in 

 the mixture of this water and Bellingshausen Sea water to the west, than in the pure 

 Bellingshausen Sea stream on the A line to the north. Fig. 60 should be compared 



