284 с. H. OSTENKELD. 



Hist., 1877, p. 348, pi. 17 ; Murray and Blackman, Trans. Roy. Soc, 

 London, Ser. B, 1898, vol. 190, p. 439, pi. 16, figs. 6—10; C. atlantica 

 Ostenfeld, Zool. Anzeiger, 22, 1899, p. 436, fig. 1. 



Is was rather surprising to find a Coccolithophora in the plank- 

 ton from such high latitudes and in such arctic water. It was seen 

 in 1905 in three samples from outside the pack-ice and in 1908 in 

 three samples also outside the pack-ice, but a little more southwards; 

 in two of the latter ones it w^as rather common, especially in lumps 

 of mucilage. It did not occur in any of the samples west of 11° 

 W. Long. On closer examination it appeared that all the specimens 

 examined were dead, as no nucleus nor chromatophores, etc., were 

 present. July —August. 



Disrib. A temperate oceanic organism, very distributed and common 

 in the Atlantic Ocean. 



Pontosphæra Lohmann, 1902. 



4. Pontosphæra borealis nov. sp. Cellulœ solitariœ globosœ, 17— 

 ^22 ц : coccolithi elliptici, 3 — A fi longi, plani vel leviter concavi, onmes 

 similes: flagella et chromatophori in spec, preservatis non distincti; 

 nucleus adest. Fig. 11. 



In seven samples (three from 1908 and four from 1906) from 

 the outer part of the pack-ice and outside it (i. e. not W. of 11^ W. 

 Long.) I found an interesting organism, viz.: a 

 species of the genus Pontosphæra. As mentioned 

 1'^^^ ifi: 'O' . I above the occurrence of Coccolithophoridœ in 

 ^% V / arctic water was a new thing, but the Cocco- 



lithophora present was dead. It is another mat- 

 Fig. 11. Pontosphæra ^er with the Pontosphæra, as its plasma showed 



borealis n. sp. 8ÜÜ t. m. . 



that the cells most probably w^ere living when 

 caught. It is then the first record of a species of Coccolithophoridœ 

 living in arctic water. The species found must be referred to the 

 genus Pontophœra, as it is understood by H. Lohmann, but I can 

 not identify it with the species hitherto described (Lohmann, 1. с, 

 p. 129—332). The cells are mostly globose, rarely of a more oblong 

 form, the coccoliths are plane or slightly concave, all of the same 

 shape, elliptic and lying closely together, covering the whole surface 

 of the cell. As only preserved material was examined no flagella 

 were found, and it was not possible to discover chromatophores^ 

 whereas a nucleus was seen. By using acids the coccoliths disap- 

 peared immediately. 



The new species resembles P. inermis Lohm., but has not the 

 distinct naked pole ("Geisselpol") for the flagella. July — August. 



