Marine Plankton from tlie East-Greenland Sea. 



335 



2. The plankton region of the pack-ice (outer group in 

 1906, intermediate group in 1908), characterized by Cyttarocijlis den- 

 ticulata, Rhizosolenia hebetata semispina and R. obtiisa, Chaet. fiircella- 

 tum, Peridiniiim subinerme, P. pelliicidum and P. ciirvipes, and Dino- 

 bryon. 



3. The plankton region of the open water (outermost 

 group in 1908) with small quantities of characteristic species: Cera- 



Sketch-map of tiie area investigated. The full line signifies the path of the Exi)edition 

 into the eoast, the broken liiie the way out. The figures refer to nos. of samples 



in the plankton tables. 



tiniu avcticiim, Peridiniiim ovatiim, (Pontosphaera borcalis and Cocco- 

 lithophorai). 



There is the [)robability that the plankton region of the 

 pack-ice corresponds t o t h e E a s t I c e 1 a n d i c P o 1 a r C u r r e n t , 

 whilst the plankton region of the coastal water corre- 

 sponds to the coastal waters mixed with water from the 

 melting snow of the land. Lastly, the plankton region of 

 the open sea may probably be referred to the circulating 

 central area of the Greenland Sea. This agrees with what 

 Damas and Koefoed say (I.e. p. 328): "les diatomées ([ui seules 

 jouent un rôle important dans le phytopiankton, prennent un deve- 



