•"'-" DIATIIMACh;,!': — COSClNdlllSClIS 



Maij: P'iiroes, very coinmon; (il N. 12" VV. to 61° N. 1^ W., 



more or less rare; 18' N. Mi VV. to 4(1" N. 57° VV.. 



coinmon. 

 .Intic: 71° N. 9—10 \\. and 69' N. \)\' W,, rare; AVestman- 



nao, rare; 62 N. 2 E., not rare; between 67 N. 11" E., 



70 N. 20 E. and 71" N. 6 E., rare. 

 Jtd.y: along the ea.st coast of (ireenland, between 71° and 



7;")- N.. usually rare, but in some spots common; 80" N. 



11- E.; 75° N. 19' E, to 79 N. 53° E., not rare; 56" N. 



H8 W. to 52' X. \'i- W., in some spots very common. 

 Aiifjiisr: along the east coast of Greenland, 71° — 73° N., rare; 



7(r N. 41° E., rare; 8(J N. 51° E., very common. 

 September: 77 N. 14" E. to 75 N. 17" E., rare. 

 October: 56" N. 31" W., rare. 



Tempefature: for the northern Atlantic 6.7, mean of 34 obs., 

 max. 19.,s, min. — I.5.' — North of South America 25. 1 to 26.?. 



Salinity: for the northern Atlantic 31 40, mean of 35 obs., 

 max. 36.83, min. 30.98, exceptionally 26..51. — North of South Ame- 

 rica 32.62. 



Plankton-type. This species is a decided arctic species, 

 occurring most abundantly along the coasts and entering the Tricho- 

 plankton. Its occurrence north of S. America is therefore extremely 

 interesting, especially as I could not find any difference between the 

 tropical and arctic form. Occurs in Bering Sea. — T, Xs. Xfj. 



COSCINODISCUS POLYCHORDUS Grax. 



(Den Norske Nordhavs Expedition, 1876— 1H7S, Protophyta pag. HO Ph. II fig. 33, 



PI. IV fig. .")6. 



1898 Marc/r. 58" N. 6" E. 

 May: 72" N. UV W. 

 July: S. of Iceland. 

 October: Filroes. 



1899 April andMay: Faroes. 



' Only such samples considered as contained this species abundantly. 



