PLATE 4. 



Fig. 1. Section Sogne Fjord (61 9' 5" N. Lat., 3" 50' 5" E. Long.) - - Iceland (66 32' N. Lat., 7 15' W. Long.), May 1896. 



The Salinity of the various layers is given in the same colours as on Pis. 1 2. 



The Isotherms and Temperature are printed in red lines and figures. The coloured double columns under individual Stations 



represent the occurence of Plankton Organisms. The individual Species are printed to the left of the horizontal lines; the 



Oceanic Species being denoted by Blue colouring, the Neritic by Red (Southern or Summer Forms); Brown representing the 



Northern or Winter Forms, and Green the Arctic Forms. 



The comparative frequency is given in various tones of colouring, the light tints indicating that the species occurs in few 



numbers, the darker denoting a plentiful appearance. 



See Hydrographical Table A, III, and Plankton Table 2. 

 Fig. 2. This represents the same Section in May 1897. Hydrographical Table A, V., Plankton Table 4. 



