16 Pp. 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 me this year (7. IJI) 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—O0 m. Temp. at 0 m. 5,73. Sal. 34,01. The plankton contained: 
Cheetoplankton. Tricho- and northern neritic plankton. Styliplankton. 
Cheetoceros criophilus ce, Chetoceros criophilus ce, Rhizosolenia styliformis r. 
C’. decipiens rr. C. diadema e, 
C. laciniosus r. 
Chiefly trichop]. with traces only of styli- and chetopl. 
b. Haul 100—0O m. Similar to a. 
ec. Haul 320—0 m. Temp. at 350 m. 2,73. Sal. 35,13. Similar to a, but also with 
animals of the stylitype (Oithona plumifera, Oncea minuta, Challengeria tridens ete.). 
This sample was examined for radiolarians, of which were found Challengerza Harstoni, 
Acanthocorys umbellifera, Theocalyptra cornuta, Dictyophimus gracilipes etc. indicating the 
same kind of water as in the deeper strata at St. O, T ete. 
8. Station X. September 5th. Lat. 71°50. Long. 19° 2'E. 
a. Haul 25—O m. Temp. at 0 m. 9,08. Sal. 34,96. 
Northern neritic plankton. Styli- and triposplankton. 
Ceratium tripos v. longipes ec, Halosphera viridis +, 
Dinophysis acuta r, Ceratium furca +, 
Gonyaulax spinifera 1, C. fusus 1, 
Peridinium depressum r, C. lineatum rr, 
P. ovatum r, C. tripos +, 
P. pellucidum r, C. trip. v. macroceros ¢, 
Chetoceros borealis v. Brightwellii r, Rhizosolenia alata r, 
C. contortus r. R. gracillima ce, 
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. 35,13. 
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 in.). 
