16 P. T. CLEVE. PLANKTON, COLLECTED BY THE SWEDISH EXPEDITION TO SPITZBERGEN. 



and besides Acanthocorys umbellifera (stylipl.) and Theocalyptra cornuta, the last named 

 being known from Kamtchatka and Greenland and found by ine this year (7. III) in the 

 surface at 63° 1' N. and 1° 36' E. 



The conclusion is that the water below 100 m. contains styliplankton and is" 

 covered with a sheet of trichoplankton-water. 



7. Station U. September Ith. Lat. 75° 50'. Long. 15° 25' E. 



a. Haul 2 — O m. Temp. at O m. 5,73. Sal. 34,9i. The plankton contained: 



Cliretoplankton. Tricbo- and iiorthern neritic plankton. Styliplankton. 



Chcetoceros criopMlus cc, Chcetoceros criopliilus cc, Bhizosolenia stylifonnis r. 



C. decipiens rr. C. diadema c, 



C. laciniosus r. 



Chiefly trichopl. with traces only of styli- and chsetopl. 



h. Haul 100 — O m. Similar to a. 



c. Haul 320 — O m. Temp. at 350 m. 2,73. Sal. 35, i3. Similar to a, but also with 

 animals of the stylitype (Oithona plumifera, Onccea minuta, Challengeria tridens etc). 

 This sample was examined for radiolarians, of which were found Challengeria Harstoni, 

 Acanthocorys umbellifera, Theocalyptra cornuta, Dictycphimus gracilipes etc. indicating the 

 same kind of water as in the deeper strata at St. O, T etc. 



8. Station X. September 5th. Lat. 71° 50'. Long. 19° 2' E. 



a. Haul 25 — O m. Temp. at O m. 9,08. Sal. 34,96. 



Northern neritic plankton. Styli- and triposplankton. 



Ceratium tripos v. longipes c, Halosphcera viridis +> 



Dinophysis acuta r, Ceratium furca -\-, 



Gonyaulax spinifera r, C. fusus r, 



Peridinium depressum r, C. lineatum rr, 



P. ovatum r, C. tripos -\-, 



P. pellucidum r, C. trip. v. macroceros c, 



Chcetoceros horealis v. Brightioellii r, Bhizosolenia alata r, 



C. contortus r. R. gracillima cc, 



R. hebetata rr, 

 R. styliformis rr. 



The plankton contained, besides, Globigerina, Acanthometron quadrifolium and other 

 species of the stylitype. The constituent plankton was thus styliplankton mixed with 

 some northern neritic plankton. 



b. Haul 230 — O m. Temp. at 200 m. 5,5. Sal. 35, i3. 



The plankton was nearly the same as in a and was examined for radiolarians. 

 Among known forms were noted Challengeria tridens, Acanthocorys umbellifera, Litho- 

 mitra lineata and Cromyomma zonaster, the last named known from Greenland (2,000 m.). 



