^•")1 DIATOMACKJ'. — TllAr.ASKlOMlUA 



Maif. 7H N. 10 W., rare; 72^ N. \)V W. to 70 N. J i" W., 



very common; t)8 N. 17" W., rare; Faroes, rare; BH" N. 



21^ W. to ()7^ X. 2;") W., common; SW. of Greenland, rare; 



from (lape Farewell to (iH N. 51-^ W., common. 

 Jiirir: 7H" N. TV W., very common; ()()' X. 28" W. to ^\~r N. 



2'.t W., very common; Westmannao, rare; Fiiroes, rare; 



tiH N. 5() W. to ()9 N. 51- W.; o'.t N. 51° W., common. 

 July: Fiiroes, common. 

 AiK/iAst: ()()" N. 55" W.; 65 —(iO N. Hli — 87 W.; Faroes; X. 



and W. of Spitzbergen, rare. 

 September: Faroes, rare; Hi)- N. 5H" W., common; H5 .V. 55" W., 



rare. 

 (Jetoher: Fiiroes, rare. 

 18SIU Mareh: m' N. 2(r— 2-1" W., rare; ()5- N. 2\' W., not rare. 

 Ajiril: B'iiroes, common. 

 May: N., S. and E. of Iceland, more or less rare; Faroes, 



rare; Hl° N. 1° W., common; 75" N. 2= 30' E. 

 June: 7)5- N. H" W., rare; ()8- N. ~r W., not rare; 76" N. 



20° K.. rare. 

 July: 71°— 71" N. 17°— 22" W., more or less rare; 80" N. 12" 



— 14° E., very common to rare; 78" N. 53° E., rare. 

 September: 75 ° N. 18° E., not rare; 80° N. 1.3" E., rare. 



Temperature : 2.7, mean of 22 obs., max. 7.s, min. — 1.6. 

 Only such samples considered as contained this species abundantly. 



Salinity: 34.o8, mean of 21 obs., 35.i8, min. 31.98. 



Plankton-type. Arctic form. I have seen it in samples 

 from Hudson Bay. — T. (Xy, Xs). 



THALASSIOSIRA HYALINA Grux.^ 



(T. Cr.KVKi Gran. Norske Nordhavs Expedition 1876—78, Protophyta PI. IV %. 



60—62.) 



1S1)8 Ajiril: (Wi' N. 24" W., not rare. 



May: 72° N. 13" W., common; (17" N. 22" W., not rare; H3° N. 



54" W., not rare. 

 Juiw: f)H" N. 55" W., very rare; H3" N. 5(i" W . rare. 



Ostenfeld's data used. 



