14. sp. T. CLEVE. PLANKTON, COLLECrED BY THE SWEDISH EXPEDITION TO SPITZBERGEN. 
Deep-sea Plankton. 
At some stations plankton was gathered by hauls from different depths. As Dr. 
Aurivituius will describe the animals found in these samples, I have examined the vegetable 
plankton and the radiolarians only, and being thus unable to give a complete account of 
these gatherings I confine myself here to shortly characterizing them so far as regards the 
phytoplankton and the radiolarians. 
1. Station M. 26 to 27 July. Lat. 77°39. Long. 1°18'E. 100—0 metres. 
Salinity at 100 m. 34,97, in the surface 32,22. Temp. 5,07. 
This sample contained trichoplankton (Chetoceros criophilus, Rhizosolenia obtusa) 
and some arctic neritic plankton (Dinobryum), but the animals indicate the presence of 
an amount of styliplankton of the same kind as in the surface west and south of Spitz- 
bergen in August and September. 
2. Station N. 28 July. Lat. 77°52'N. Long. 3°5' W. 
a. Haul 10—0 m. Temp. at 0 m. 3,6%. Salinity 34,38. Chiefly chetoplankton 
(Chetoceros decipiens, Pheocystis Pouchetii) and arctic neritic plankton (Dinobryum). 
b. Haul 25—0 m. Temp. at 25 m. 2,72. Salinity 34,74. The same kind of 
plankton. 
c. Haul 100—O m. Sal. at 100 m. 35,03. Plankton sparingly (Phwocystis Pouchetii). 
d. Haul 500—O m. Temp. at 100 m. + 0,83. Sal. 35,03. Content the same as a, 
but, in addition, Rhizosolenia gracillima and some animals of the styliplankton-type. 
The conclusion is, that the deeper strata contained styliplankton, the upper cheto- 
plankton. 
3. Station O. 29 to 30 July. Lat. 78°13'N. Long. 2°58 W. 
a. Haul 100—O m. Temp. at 0 m. 3,1, sal. 33,76; at 100 m. 1,17, sal. 35,03. 
Content: chiefly Ph@ocystis Pouchetii, thus cheetoplankton. 
b. Haul 500—O m. Temp. at 500 m. 0,93, sal. 35,03. Content as a, and besides, 
rarely Challengeria tridens and some other styliplankton forms. 
c. Haul 2,600—0 m. Temp. at 2,700 m. —1,48, sal. 34,96. Chiefly as a but 
with radiolarians of many species sparingly. Among the radiolarians were found a number 
of new forms which will be described further on. Among known forms Aulacantha 
levissima, Challengeria tridens and Trochodiscus echinidiscus are known from the Farée 
Channel, Stichopilium Davisianum from the bottom mud near Greenland, also Artro- 
strobus annulatus, which latter was first found near Kamtchatka. Dictyophimus gracilipes 
is known from Kamtchatka only. Challengeria Harstoni was dredged by the Challenger- 
expedition from the abysmal depths cast of Japan. Among the new forms is Polypetta 
holostoma, allied to P. tabulata from the central Indian Ocean. Aulodendron antarcticum, 
Auloscena spectabilis and Sagenoscena penicillata are known from the Antarctic Ocean only. 
