INTRODUCTION 



The present paper is based upon the examination of a number 

 of plankton samples collected during the "Danmark Expedi- 

 tion" to N. E.-Greenland 1906 — 1908. The samples have been col- 

 lected by means of fine-meshed tow-nets and are all surface samples. 



In the introduction to another paper on the Diatoms and Fla- 

 gellates of the same samples I have rendered, more in details, an 

 account of the data concerning the collection, etc. It will therefore, 

 I think, be sufficient to repeat here the more important data. 



The samples examined originate all from more or less ice-filled 

 water which may be divided into three areas: 



1". Samples taken in the pack-ice (drift-ice) in August 1906 and 

 July 1908. The geographical area is about 73° 30' — 76" N. Lat. and 

 6°— 13" W. Long. 



2". Samples taken in the coastal water west of the pack-ice 

 and east of the coast of Greenland, between 76" — 78°N. Lat. ; August 

 1906 and July 1908. 



3°. Samples taken in Danmarks Havn, Germania Land, 76°46'N. 

 Lat., 18"43'W. Long., during the stay of the Expedition from the 

 autumn of 1906 to July 2pt 1908. 



As already pointed out in my above mentioned paper, the sam- 

 ples from the last area are of greatest interest, but unfortunately it 

 has not been possible for the Expedition to take samples during 

 the whole time of the stay, at regular short intervals. There are 

 only a few samples from October 1906, circa 10 from June — Sep- 

 tember 1907 and a couple from July 1908 when the steamer left 

 the harbour. 



From the opposite coast of Greenland, the west coast, we have 

 Vanhöffen's valuable regular collection of the plankton of Kara- 

 jak Fjord, ca. 70" N. Lat., upon which K.Brandt (1896) has based 

 his interesting paper on arctic Tintinnodea. It is but natural that 

 the samples from these two points on the coasts of Greenland are 

 to be compared; and the following list will show a close resem- 



XLm. 22 



