THE SPECIES AS ADULTS 



203 



THE SPECIES AS ADULTS 



The adults of the ten species described in this report are easily distinguished from one 

 another by their structural characters. Both sexes of each may be recognized by the struc- 



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ANTARCTIC CONVERGENCE 



EDGE OF PACK-ICE 



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Fig. 6. Diagram showing the distribution of species of Euphausia in the surface waters of the Antarctic and 

 sub-Antarctic Zones ; the blacked in portion of each column shows the normal range of that species, the 

 entire column the possible range. 



ture of the antennular peduncle, the shape of the rostrum and front part of the carapace, 

 and the presence or absence of abdominal spines or processes ; the males may be dis- 

 tinguished by the structure of the copulatory organ on the first pleopod. They can also 

 be separated when fresh by one who has seen and examined many of them by their 

 general appearance — that sum of all the small characteristics of shape and colouring 



