4 ASTRID CLEVE-EULER, QUANTITAT1VE PLANKTON RESEARCHES IN THE SKAGER RAK. 



As a continuation of the two, already described series from February and June 1912, 

 1 give a description of six subsequent ones, arranged chronologically. They were dated 



1. August 15—16, 1912. 



2. November 6—8, 1912. 



3. April 25—26, 1913. 



4. August 1 — 3, 1913 (only from the Norwegian stations). 



5. February 25—26, 1914. 



6. April 17—18, 1914. 



59° 



Fig. i. 



From the following stations I have got, as a rule, complete collections of samples, 

 taken from the surface to somewhat above the bottom at every lOth metre until a depth 

 of 60 m, then at every 20th metre until a depth of 100 m and, lastly, at 150 m, 200 m, 

 300 m, if the depth surpassed these numbers. 



Extra II (at the mouth of Kattegat) 57° 43' N., 11° 7' E. 

 Skag. 0. 57° 41' N., 11° 24' E. 



9° 51' E. 

 9° 40' E. 

 9° 18' E. 

 8° 56' E. 



Skag. 5. 57° 42' N. 

 Skag. 6. 57° 56' N. 

 Skag. 8. 58° 10' N. 

 Skag. 9. 58° 21' N. 



Some other stations are represented in single series only; they are: 



