EUPHAUSIA LUCENS 



209 



not so distant from it, and the waters of lower temperature in which E. lucens usually 

 occurs, to the west. 



Apart from this exceptional area the highest surface temperatures of the stations at 



Fig. 10. Chart showing the occurrence of £. lucetis and £". frigida at the stations made in the Falkland 

 Sector in the summer of 1931-2. The thick Hne represents the Antarctic convergence. 



which it was found were from 12 to 14° C, except for the nearest of those to the south- 

 west of Western Australia where it was i6-i2° C. 



The lowest surface temperature at which it was found, 5-02° C. at a station just north 

 of the Antarctic convergence to the east of the Falkland Islands, is in another exceptional 

 area; other warmer sub- Antarctic forms, e.g. E. similis, are found farther to the south 

 here than elsewhere. Their presence is due to the unusually strong southward move- 

 ment of sub-Antarctic water in the Falkland region. Elsewhere the lowest temperatures 

 at which E. lucens was found were 6-5-7° C. 



