284 <•• H- osTi.M 111). 



Hist., 1S77, j). ;US, ])1. 17; Miin;iy niid BlacUinnn, Trails. H(n'. Soc, 

 London, vSor. B. 1898, vol. 190, p. 439, pi. Ki, (ij^s. (> 10; C. athmtica 

 OslcnlVld, Zool. Aii/.cii^cr, 22, 1899, j). liifi, lii^. 1. 



Is was rallier surprising; lo lind a Covcolithophora in Ihe plank- 

 ton Ironi sudl high laliludrs and in such arclic water. It was seen 

 in 1905 in three sanij)les Ironi outside the pack-ice and in 1908 in 

 three samples also outside the pack-ice, hut a Utile more southwards; 

 in two of the latter ones it \Yas rather common, es[)ecially 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 tem|)eratc oceanic organism, very distributed and coninioii 

 in the Atlantic Ocean. 



PontospliîPra Lohmann, 1902. 



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

 22fjt; coccolithi elliptici, 3~i /i longi, plani vel leviter concavi, omnes 

 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 



^(^^^ |t? , '.Q^ above the occurrence of Coccolithophoridœ in 



^®^ \: '■ Jj arctic water was a new thing, but the Cocco- 



lithophora present was dead. It is another mat- 

 Fig. 11. Pontosphæra ^g^. y^[[\i the Pontosphæra, as its plasma showed 

 borealis n. sp. 800 t. m. ' ^ . . 



that the cells most probably were 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. c, 

 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. 



