298 С. H. Ostenfeld. 



has not been seen since then. This species I have found not rarely 

 in a single sample from Danmarks Havn, Aug. 15*^ 1907, and I have 

 been" able to study it a little more in details. A single specimen was 

 further found in a sample from the coastal water off Cape Amelie 

 in Aug. 1906. 



My specimens differ in some points from Brandt's description, 

 but I think it correct to retain them under his species. The houses 

 are 210-240// long (Brandt gives 0,14— 0,15 mm.) and 120—140/^ 

 broad. The lower end has mostly a small tip, more rarely it is 

 rounded as in Brandt's figure; and near the mouth a varying number 

 of rings are seen, but they are very fine and often difficult to ob- 

 serve. The wall of the cylindrical house is hyaline and with high 

 power of magnification the fine "Primärwaben" are discernible; 

 sometimes very small foreign bodies are sparingly fixed upon the 

 wall. The animal itself has two nuclei and a large vacuole; it is 

 adherent to the innerside of the tip of the house by means of a 

 stalk, — as far as preserved material (in alcohol) allows to judge. 



The species seems to have a very short time of plankton life; 

 it was present in Danmarks Havn in one sample from Aug. 15, but 

 not in samples from Aug. 4*^ or 24*^ of 1907, and further in one 

 sample from Aug. 15*^ 1906; temperature of the water was + 0,4° 

 and -Ч- 0,4° С respectively. 



Di strib. Arctic neritic species, hitherto only known from Karajak Fjord 

 (March) and in our area (August). 



II. Radiolaria. 



As said above (p. 290), surface samples are not suitable for Ra- 

 diolarians, and besides arctic waters have few species; it is then but 

 natural that very few forms were seen in the collection. 



A. Acanthometrida. 



In three samples from the autumn 1907 from Danmarks Havn 

 and in five samples from the coast water in July 1908 undetermined 

 forms of Acanthometrida were seen. As far as I could find, the 

 transverse section of the spines was quadrangular and no basal 

 wing-cross was developed; it may then have been a species of 

 Acanthoma, most probably A. ligurina Hæckel (cfr. Popofsky 1905). 



