COPEPODA 



175 



Metridia brevicauda, Giesbr. Mr Andrew Scott records two forms of this species. 

 Form (a) 



It is seen that the species is usually confined to the intermediate layer, but a single 

 specimen was taken at the surface at St. WS 44 in the Antarctic Zone, and very many 

 were taken at the surface at St. WS 70 in the sub-Antarctic Zone. It has not been 

 recorded before in the Antarctic Zone. 



Metridia gerlachei, Giesbr. This species has been shown by previous expeditions to be 

 a typically Antarctic species. Farran (1929), in his report on the Terra Nova collections, 

 writes that it "was found mainly from the Antarctic Circle southwards. . ..The most 

 northerly point at which live specimens were taken was 6i° 18' S, but a few dead 

 specimens were found as far north as 52 41' S". In our area we see that it was taken 

 at the majority of stations round South Georgia and at St. 161 to the south-west, but as 

 one would expect it was absent from stations to the north of the line of Antarctic Con- 

 vergence. Its distribution is shown in Fig. 79 and its vertical distribution in Fig. 80. 

 It rarely occurred in the top 50 m., it being most abundant between 500 and 100 m., but 

 extending down to below 1000 m. As one would expect, it was not usually met with 



23-2 



