260 С. H. Ostenfeld. 



As to the samples collected before and after the stay in Dan- 

 marks Havn, we have (1°) a fair collection from August 1906 and 

 July 1908 taken in the more or less ice-filled water along the coast 

 from off Koldewey Island (ca. 76°30' N. Lat.) to ca. 78° N. Lat., and 

 further (2*^) an interesting collection from the traversing of the pack- 

 ice in both years (July — August). During the homeward voyage in 

 July 1908 the samples from the coastal water and the pack-ice were 

 taken with intervals of only one or a few hours, and a preliminary 

 examination soon showed that it was not necessary to work out 

 more than a selected number. In the following list I have enume- 

 rated the species of Diatoms and Flagellates, in another paper 

 Mr. OvE Paulsen will treat of the Peridinians. With regard to 

 the Zooplankton the collecting method with small open conical nets 

 of fme-meshed silk-gauze is not well adapted to the capture of the 

 larger organisms, metazoa; other samples taken by the Expedition 

 with larger coarse-meshed nets and at different depths give better 

 results; they will form the subject of papers by zoologists; it will, 

 therefore, not be necessary to undertake a closer examination of the 

 surface samples in this respect. On the other hand, the Protozoa, 

 at least the Tin tinn odea, require fine-meshed nets for catching, 

 and in a little separate paper I shall enumerate the species of pro- 

 tozoa found in the samples. 



Finally Mr. Paulsen and I in common will write on the surface 

 plankton samples as a whole describing the general character of the 

 plankton, the supposed origin of the organisms, etc. under compari- 

 son with the hydrographical conditions and using the papers publi- 

 shed by other planktologists on the plankton of the East Green- 

 land Sea. 



The list here given contains the names of all the plankton 

 Diatoms and Flagellates determined from the samples, wdth quota- 

 tions of the first description, of the more important synonyms and 

 figures, as well as of the general works (e. g. Gran's Diatoms in 

 Nordisches Plankton). Critical remarks elucidated by figures are 

 annexed to several species. The list further gives the occurrence in 

 the region, divided into the three above mentioned areas: Dan- 

 marks Havn, the coastal water and the pack-ice, and the 

 time for the presence in the plankton, as far as the scanty data allow 

 it. At last the area of distribution is given summarily. The exa- 

 mination did comprise 64 samples. 



The littoral diatoms and the diatoms of the ice-floes are deter- 

 mined by Mr. E. ØSTRUP who publishes his results together with a 

 treatment of the freshwater diatoms. 



