322 С. H. Ostenfeld and Ove Paulsen. 



The drift-ice samples are specially characterized by such organ- 

 isms as Chaetoceras decipiens, C. furcellatiim and C. sociale, Cosci- 

 nodisciis oculus iridis (=subbuliens), Fragilaria oceanica, Thalassiosira 

 gravida — all of which are regarded by Cleve as arctic forms — and 

 thus show a good agreement with the samples dealt with here. 



The fjord samples are all very poor; the most prominent species 

 are Chaetoceras decipiens, Dinobryon pelhicidum (only in some samp- 

 les), Calamis finmarchiciis, \\hi\sl Ceratiiim arcticiim, Cyttarocylis yigan- 

 tea and Oitbona similis occurred in quantity in a few samples. 



Lastly, from the Duke of Orleans' Expedition of 1905 we have 

 an interesting work by D. Damas and E. Koefoed, which in the 

 introduction speaks of the rich phytoplankton found in July — August 

 in the drift-ice and in the coastal waters of East Greenland, in con- 

 trast to the small quantities found in the open Greenland Sea, but 

 otherwise does not deal with the microplankton. The phytoplankton 

 was determined by H. Broch, w^ho has arranged it in tabular form 

 without text. 



According to В roch ' s tables the most prominent species in the 

 phytoplankton are Ampiprora hyperborea, Bacterosira fragilis, Chae- 

 toceras atlanticum, С boréale, С. criophilum, С. decipiens, С. furcella- 

 tum. С- Wighami, Fragilaria oceanica, Navicula Vanhojfenii, Nitz- 

 schia delicatissima, Thalassiosira gravida, T. hycdina, T. Nordenskiöldii, 

 Phaeocystis Pouchetii. Specially prominent are Fragilaria oceanica 

 and Thalassiosira gravida. Chaetoceras criophilnm was predominant 

 in a single sample from the open sea, whilst Ceratium arcticum, just 

 as in the other samples, was rare. These samples show good agree- 

 ment on the whole with ours, except that Thalassiosira gravida and 

 Chaet. criophilum play a much smaller role in our samples. ^ 



I. Plankton from Danmarks Havn. (Table 1). 



It has several times been emphasized in our previous papers, 

 that the collecting of plankton in Danmarks Havn, where the Ex- 

 pedition was stationed for ca. 22 months (1906-1908), has unfortu- 

 nately been very incomplete. A series of samples collected at regu- 

 lar intervals could have given an excellent picture of the develop- 

 ment of the plankton throughout the year, but from the few sam- 

 ples collected occasionally which we have, we obtain only an imper- 



^ Unfortunately there is not always agreement between Broch's tables and the 

 published „Journal des stations" of the Expedition. Tims for Station 44 the 

 table has a haul of .'590— 300 m. with a rich diatom plankton, wliicli seems pe- 

 culiar at this great depth. In the Journal this liaul is not mentioned, but a 

 corresponding one of ;500 — Om. witii almost the same organisms. Other differ- 

 ences also occur. 



