^ni) niATOMACIi/l'. — (;Hyl';TOCEKOS 



CH^TOCEROS DANICUS Cl. 



(Diatoms of Finland. PI. Ill fig, 18, 19;. 



1898 Mardt: 21° N. 18^ W.; 41° N. 21° \V. 



1899 May: 58' N. 4°— 7" K. (very common). 



Temperatupe: 14.9 — 15. 



Plankton-type. This species is evidently no oceanic form and 

 occurs along the coasts of the temperate eastern Atlantic. Found in 

 Pugret's Sound. — Xni. 



ch.s:toceros debilis (Jl.' 



((inAN I). Norske Nordhavs-Expedition, Protophyta PI. II fig, 14, 15). 



1898 March: 58" N. 6" E. (common); Faroes (rare); 6.3- X. 18- W 

 (not rare); 41° N. 60° W. (common) to 40° N. 69° W. (not 

 rare). 



April: abundant along the south coast of Iceland and at the 

 Faroes; 42° N. 47° W. to 40- N. 70- W (common). 



May: 59° N. 49° W., common; Westmannao, common; Faroes, 

 not common. 



June: 66° N. 24° W. (rare); South of Iceland, 63° X. 13°— 

 22° W., very common; Faroes, rare; 42° N. 9° W. (rare). 



July: Westmannao, very common; Faroes, rare; Shetlands, 

 very common. 



August: E. Greenland, 66° N. 35° 33' W., common; W. Green- 

 land, 69° N. 53° W. not rare; SW. and S. of Iceland, com- 

 mon; Faroes, common; Shetlands, rare; 54° N. 5" W. rare. 



September: E. Greenland, 65° N. 36° W. very rare; W. Green- 

 land, 69° N. 53° W., rare; Westmannao, common; (50" N. 

 2° W. (not rare).^ 



' Ostenfeld's data used. 



'' In my paper in Ofvers. Kongl. Sv. Vet. Akad. Forh. 1899 n. 8 the Engl. 

 Channel has heen erroneously indicated. 



