10 P. T. CLEVE. f-LANKTOIsr, COLLECTEt) BY THE SWEDISH EXPEDITION TO SPITZBERGEN. 



2. Lofoten— Beeren Eiland. 



June 2(1 to June 12th. 



Temperature 7,55 to 5, is; near Beeren Eiland 2,4o. Salinity 34 — 35. 

 The ruling plankton is chajtoplankton, mixed with variable ainounts of tricho- and 

 styliplankton. 



In the trichoplankton : In the styliplankton: 



Calanus finmarchicus c, Oithona 'plumifera rr, 



Chcetoceros criophilus c, Collozoum inerme -\-, 



Coscinodiscus oculus iridis r, Chcetoceros volans -f- 

 Rhizosolenia semispina -\-, 

 Thalassiothrix longissima r. 



Interesting is the occurrence of the styli planktonforms, of which Oithona plumifera 

 and Collozoum indicate a far distant origin (probably the region of the Azores). Flecto- 

 jphoin arachnoides indicates that the water has passed the Färöe Channel. 



In June 1896 and May 1897 this region was almost sterile, containing traces only 

 of northern neritic plankton. 



In the choetoplankton : 

 Plectophora arachnoides r, 

 Chmtoceros criophilus c, 

 C. decipiens c, 

 Phceocystis Pouchetii (c near 

 Beeren Eiland). 



3. Beeren Eiland — Hope Island. 



June 20th to June 23d. 



Temperature — 0,35 to -|-0,97 and salinity 34,76 to 32,97. 



The ruling plankton is chsetoplankton with Chcetoceros decipiens and Phceocystis 

 Pouchetii; tricho-plankton is also represented by Calanus finmarchicus, Cyttarocylis gigantea 

 and Coscinodiscus oculus iridis, and arctic neritic plankton by the rare occurrence of 

 Ptychocylis obtusa. 



4. Hopa Island— Icef jord. 



June 24th. 



Temperature 0,6 to 3, o. Salinity 33, so to 35,06. 



An almost sterile region with some few specimens of Phceocystis Pouchetii (C) and 

 Thalassiosira Nordenskiöldii, Chcetoceros furcellatus, Ptychocylis obtusa and Peridinium 

 pellucidum {Ng). 



5. Icef jord— Swedish Depth— Siid Oape. 



July 26th to Angust 2d. 



The plankton is subject to great variation, occurs as a rule sparingly and belongs 

 to chaäto-, styli- and tricho-plankton. In August 1896 chfeto-plankton chiefly ruled in 

 this region. 



