•> ft- DIATO.MACK/H — KIIIZIISOLKMA 



Aiifjust: IT -HS^ N. 1^—8" K., in some spots common. 

 Sfplcniber: 7(f N. 13° E. to 7;")" N. 17° K., not rare. 

 Xornnhcr: irv" N. 52" W.; 52" N. 8H" W.; :V.^ N. o() W. 

 Davmhrr: oO^ N. 9° W.; 1H" N. 10° W. 

 1«!)9 March: 1-9° N. 9" W. 



Temperature: 7.s, mean of 17 obs., max. 12, min. ;')..)(. 



Salinity: 81.8s, mean of 17 obs., max. .45.«5, min. .S2.68. 



Planlcton-type. The distribution is very remarkable, first for 

 the by no means rare oaurrence in the arctic and northern Atlantic 

 in 1898 and its total absence there in 1899, secondly for its absence 

 in the temperate Atlantic. It is found in the Tricho-plankton of 

 the Bering Sea. There is thus reason to believe that it derives 

 ultimately from the northern Pacific. — T. 



RHIZOSOLENIA OBTUSA Hensex.^ 



(Ji. cdnta ritr. iriiiii:(U(( Gran. D. Norske Nordhavs-Expedition, 1876—78, Proto- 



phyta PI. V fig. 4:1). 



1898 March : M" N. if E ; 4-1° N. 60° W. 



April: 63° N. 18° W.; 66° N. 21-^ W., not rare. 



Mai/: IQP—TI' N. 13°— 14° W.; Faroes rare to very common; 



Shetlands, rare; 60°— 62° N. 2°— 3" E., not rare; 61° N. 



11° W., very rare; 57° N. 25° W., rare; .58°— 60° N. 35^— 



38° W., 59° N. 49° W. and 63° X. 54° W. 

 June: 69° N. 15' W.; Denmark's Sound; 62° N. 14" W.; Fiiroes, 



very common; 62° N. 2° E.; SE. of Beeren Island. 

 July: Faroes, rare; 78° N. .5° E. 

 August: 77°— 78° N. 11°— 12° E., rare to common. 

 September-: Faroes, common; 59' X. 50° W. and 69" N. 



.53° W., rare; 76° N. 13° E. 

 December: 1-1° N. 66° W. 



1899 March: 49° N. 9° W., rare. 

 April: Westmannao, rare. 



Maxj: 61°— 62° N. 1°— 2° E., rare. 



Ostenfeld's data used. 



