Algae. — Eumycetes. 335 



6. Coccolithophora pelagica is a strongly oceanic, holoplanctonic^ 

 stenohaline and eurythermic organism whose home is the temperate 

 and warm oceans. In our area it can serve as a leading organism 

 for oceanic water, as its occurrence restricted to the Atlantic, the 

 Norwegian Sea, the English Channel and the southermost of 

 the North Sea. 



7 — 8. Distephanns speculum and Dictyocha fibula are oceanic, 

 holoplanctonic, eurythermic and euryhaline organisms ofverywide 

 distribution; their eastern limits in the Baltic are (with Single 

 exceptions) the Belt Sea. 



9. Elvia tripartita is a holoplanctonic brackwater organism of 

 eurythermic and euryhaline character. It has its home in the inner 

 Baltic (but outside Nr. 4, i.e. not north of ca. 63°30' Lat. N.) and 

 is from there spread west- and southwards, but does not (with 

 Single exceptions) occur in the North Sea and farther out. 



The main features of distribution of most of the named orga- 

 nisms are illustrated on Charts (iO Charts on 3 plates). 



It is a remarkable fact that the füll life-C3'cle is not known 

 with regard to any of the nine organisms. Author. 



Ostenfeld, C. H., Marine Plankton from the East-Green- 



land Sea (W. of 6° W. Long, and N. of 30° 30 N. Lat.) 

 coUected during the "Danmark-Expedition" 1906—1908. 

 I. Lists of Diatoms and Flagellates. (Medd. om Grönland. 

 XLIII. 11. p. 257—285. with 11 figs. in the text. Kobenhavn 1910.) 



The plankton samples examined have bcen collected by the 

 scientists of the "Danmark-Expedition" and originale all from more 

 or less ice-fiUed Avater, they may be divided into three groups: 



1. Samples taken in the pack-ice (drift-ice) in August 1906 and 

 July 1908, the geographical area being about 73° 30^— 76° N. Lat. 

 and 6^-13° W. Long. 



2. Samples taken in the coastal water west of the pack-ice and 

 east of the coast of Greenland, between 76°— 78° N. Lat., Aug. 

 1906, July 1908. 



3. Samples taken in Danmarks Harbour, Germania Land, 

 76° 46' N. Lat., 18° 43' W. Long., during the stay of the Expedition 

 from the Autumn of 1906 to July 21»^ 1908. 



The samples from the last area are of greatest interest, but 

 unfortunately samples have not been taken during the whole time 

 of the sta\% at regulär short intervals. 



The list contains 43 species of diatoms and 6 flagellates (in wide 

 sense). Auxospores have been found in Cosciuodisciis siihhidiensyöxg. 

 and in C. Jörgenseuii Ostf (nom. nov.). In Chnetocevas boreale curious 

 chains with aborted awns are found and tigured, and in Ch. deci- 

 piens chains with microspore-formation. A new species Chaetoceras 

 cevatospoviim (= Ch. gracile Apstein, non Schutt) from the Baltic 

 Sea is mentioned by the wa3^ 



It was unexpected to find Coccolithophora pelagica as far north 

 (but only dead specimens!) and also a new species Potitosphora 

 borealis Östf. Author. 



Appel, O. und H. W. Wollenweber. Die Kultur als Grund- 

 lage zur besseren Unterscheidung systematisch 



