',\'22 ^'- H- Osri.M i:i.u ;m(l ()\i; Paii.skn. 



Tlic (liifl-ice samples are specially eliaraclerized by such organ- 

 isms as (]h(iel()cerns dccipiens, C. furcclhituni and C. sociale, Cosci- 

 nodiscus oculiis iridis (= siibbnliens), Fra<jil<nia oceanico, Thrdassiosira 

 (//•(inidd all ol which are regarded by ('leve as arclic forms — and 

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



The fjord sam[)les are all very poor; tlie most [)rominent species 

 are Chaetoceras decipicns, Dinohvijon pellucidiim (only in some samj»- 

 les), (Ailaniis /iiiiuctrchicns, whilst Ceratiiiin arclicum, Ciitlaroct/lis (ji(jun- 

 Icft and Oillwna similis occurred in (juantity in a few samples. 



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

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

 introduction speaks of the rich [)hytoplankton found in -Inly August 

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

 trast to the small ([uantities found in the o|)en Greenland Sea, but 

 otherwise does not deal with the microplankton. The phyt(){)lankton 

 was determined by H. Broch, who has arranged it in tabidar form 

 without text. • 



According to Brochs tables the most prominent species in the 

 phytoplankton are Ampiprora hyperhorea, Bacterosira frm/ilis. Chae- 

 focerds (dlanticiim, C. boréale, C. criophihim, C. decipiens, C. furcella- 

 tiim. C- Wighami, Fragilaria oceanica, Nauicida VanhafJ'enii, Nitz- 

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

 Phaeocijstis Pouchetii. Specially prominent are Fragilaria oceanica 

 and Thalassiosira gravida. Chaetoceras criophilum was predominant 

 in a single sample from the o})en sea, whilst Ceratium arclicum, just 

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

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

 Chael. criophilum i)lay 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 n)onths (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 tliere is not always agreement between Broch s tables and the 

 published ^Journal des stations" of the Expedition. Thus for Station 44 the 

 table has a haul of 390- 300 m. with a ricii diatom plankton, which seems pe- 

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

 corresponding one of 300 — Om. with almost the same organisms. Other differ- 

 ences also occur. 



