DIATOMACli.K -NAVICULA, MTZSCHIA HHH 



Tempepature : — O.s, mean of 3 obs., max. — i, min. — O.o. 

 Salinity: 33. lo, max. 33.7s, min. 32.c6. 



Plankton-type. Found at Iv and W. (ireenland, in Hudson 

 Hay, Barent's Sea and the. Baltic. — Xf/. 



NAVICULA MEMBRANACEA Cl. 



(A Treatise on the Phyto-plankton PI. II fig 26— 28.f 



1898 March: 21° N. 18^ W.; IP.' N. 48'^ W.; 42^ N. Wv W. 

 Apiil: 29 N. 24^ W 

 Noccmbcr: 42^ N. tji^ W. 



Temperature: lo.s, mean of 5 obs., max. 17.6, min. 13. 

 Salinity: 35.4? and 35. .-,i. 



Plankton-type. 1 have seen this species in samples from the 

 Red Sea. Lemmerjiaxx mentions it from New Zealand. — .S. 



NAVICULA SEPTENTRIONALIS Oestrup.^ 

 (Marine Diatoraeer fra Ustgronland Kbhn. 1895 PI. VIII f. 97.) 



1898 June: m' N. 54" W 



1899 May: lb° N. 2^ 30' E. 

 Jaly: 74" N. 2(»- W. 



Temperature: — 1 to B.i. 

 Salinity: 29.95 to 34.9:,. 



Plankton-type. Noted from E. and W. Greenland and the 

 Baltic. — Ng. 



NITZSCHIA DELICATISSIMA Cl.^ 



(A Treatise on the Phyto-plankton. PI. II fig. 22.) 



1898 Apiil: 59° N. 22°— 28' W., common. 



May: 59° N. 13°— 15° W.; Faroes, common; 57°— 60° N. 28° 

 W.; BO'— 58° N. 31°— 35 W., common. 



' Ostenfeld's data used. 



