.-)!■* DlATO.MACEyl^ — KHIZOSOLKMA 



Aufjust: 11^ — 76"^ N. 12° — S'^ E., in some spots common. 

 September: 7H- N. 13° E. to 7o° N. 17^ E., not rare. 

 November: 4,¥ N. 52° W.; 52' N. 88° W.; 5:5 N. 50^ W. 

 December: 50° N. \r W.; 4.S° N. 10° W. 

 IStty March: i9° N. 9^ W. 



Temperatupe : 7.s, mean of 17 obs., max. 12, min. 5.34. 



Salinity: Bi.ss, mean of 17 obs., max. 85.nr,, min. 82.63. 



Plankton-type. The distribution is very remarlcable, first foi- 

 the by no means rare occurrence 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 Hering Sea. There is tluis reasoti to believe that it derives 

 ultimatelv from the northern I'acilic. — 7'. 



RHIZOSOLENIA OBTUSA Hensen.^ 



{R. (ildta nir. irmicdta Gran. D. Norske Noidhavs-lvxpedition, 1876 — 78, I'roto- 



phyta PI. V lig. 41). 



1898 MareJi: 58° N. H° E ; 41° N. ()0° W. 



Api-il: ()3° N. 18° W.; ()H° N. 24° W., not rare. 



Maif. 70° — 72° N. 13° — 14° W.; Faroes rare to very common; 



Shetlands, rare; 60°— 02° N. 2°— 8° E., not rare; 61" N. 



11 W., very rare; 57° N. 25° W., rare; 58°— 60° N. 85°— 



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

 June: ()9° N. 15° W.; Denmark's Sound; 62° N. 14° W.; Fih'oe.s, 



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

 J Lily : Fiiroes, rare; 78° N. 5° E. 

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

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



58° W., rare; 76° N. 18° E. 

 December: 41° X. ()6° W. 

 •1899 Man-h: 49° X. 9° W., rare. 

 April: Westmannao, rare. 

 May: 61°— 62- N. 1°— 2° E., rare. 



Ostenfeld's data used. 



