CONCLUSIONS 215 



without reference to their circumpolar distribution. The exceptions are Sagitta maxima and Euphansia 

 vallentini, and these are not usually found in the Antarctic surface water. We are thus dealing with 

 all except the rare species and a few which happen to be difficult to identify. 



DECREES EAST DECREES WEST 



O 20 40 60 80 lOO I2Q I4Q 160 ISO 160 UP I2Q IPO 6Q 60 4Q 2Q O 



N9 OF SAMPLES EXAMINED 



OSTRACODA 



CONCHOECIA HETTACRA 



COPEPODA 



CALANUS ACUTUS 

 C. PROPINQUUS 

 C. SIMILUMUS 

 RHINCALANUS CICAS 

 PLEUROMAMMA ROBUSTA 

 METRIDIA CERLACHEI 

 HALOPTILUS OCELLATUS 

 H. OXYCEPHALIC 

 PAREUCHAETA ANTARCTICA 

 EUCHIRELLA ROSTROMACNA 

 HETERORHABDUS AUSTRINUS 

 CANDACIA SPP. 



AMPHIPODA 



PARATHEMISTO CAUD1CHAUDI 

 PRIMNO MACROPA 

 VIBILIA ANTARCTICA 

 EUSIRUS ANTARTICUS 

 CYLLOPUS SPP. 



EUPHAUSIACEA 



EUPHAUSIA SUPERBA 

 E. FRICIDA 

 E . TRIACANTHA 

 THYSANOESSA SPP. 



Fig. 5. Continuation of Fig. 4. 



It has been shown that, with the exception of Eusirus antarcticas, each of these species has been 

 found at one time or another at least once in every 20 sector round the whole circle of 360 south of the 

 Antarctic Convergence. All of them, including E. antarcticus can properly be described as having 

 a circumpolar distribution; and there can scarcely be any doubt that such gaps as appear in this 

 species would be eliminated with further sampling. It is thus reasonable to infer that this circumpolar 



