10 P. T. CLEVE. PLANKTON, COLLECTED BY THE SWEDISH EXPEDITION TO SPITZBERGEN. 
2. Lofoten-—Beeren Eiland. 
June 2d to June 12th. 
Temperature 7,55 to 5,15; near Beeren Eiland 2,40. Salinity 34—35. 
The ruling plankton is chetoplankton, mixed with variable amounts of tricho- and 
styliplankton. 
In the chetoplankton: In the trichoplankton: In the styliplankton: 
Plectophora arachnoides 1, Calanus finmarchicus c, Oithona plumifera rr, 
Cheetoceros criophilus c, Chetoceros criophilus ce, Collozoum inerme +, 
C. decipiens c, Coscinodiscus oculus iridis r, Chetoceros volans +. 
Pheeocystis Pouchetii (¢c near —- Rhizosolenia semispina +, 
Beeren Eiland). Thalassiothrix longissima r. 
Interesting is the occurrence of the styliplanktonforms, of which Oithona plumifera 
and Collozowm indicate a far distant origin (probably the region of the Azores). Plecto- 
phora arachnoides indicates that the water has passed the Farde Channel. 
In June 1896 and May 1897 this region was almost sterile, containing traces only 
of northern neritic plankton. 
3. Beeren Hiland—Hope Island. 
June 20th to June 23d. 
Temperature —0,35 to +-0,97 and salinity 34,76 to 32,97. 
The ruling plankton is chetoplankton with Chetoceros decipiens and Phaocystis 
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. Hope Island—Icefjord. 
June 24th. 
Temperature 0,6 to 3,0. Salinity 33,80 to 35,06. 
An almost sterile region with some few specimens of Pha@ocystis Pouchetii (C) and 
Thalassiosira Nordenskidldii, Chetoceros furcellatus, Ptychocylis obtusa and Peridinium 
pellucidum (Ng). 
5. Icefjord—Swedish Depth—Siid Cape. 
July 26th to Angust 2d. 
The plankton is subject to great variation, occurs as a rule sparingly and belongs 
to cheto-, styli- and tricho-plankton. In August 1896 cheto-plankton chiefly ruled in 
this region. 
