niATOMACE.-K — ACHN A NTH KS. AMl'll 1 1'HOl! A 281 



Diatomaceae. 



ACHNANTHES Ti^NIATA (iKUx.^ 

 vCi.. i^ (JRLN. Arct. Diatom. I'l. 1 d-.'. 5.) 



1898 May: (y(f N. -1" W. to b~r N. 44" W. (s])aringly). 

 June: S. of Iceland, very rare. 



1899 June: 75° N. 20" E. 



Temperature: O.h. 



Salinity: o'l.i".. (evidently too high). 



Plankton-type. Noted from Hudson Hay and the .shores of 

 the Arctic Seas, the Baltic (at Bornholm, in th(> Hay of Finland and 

 at Aland, always in the spring). — X(j. 



AMPHIPRORA HYPERBOREA (iRLx. 



{A. j>aliuli>sa '. ? /n/fi. (Irln. Cr.. i^c Grtn. Arct. Dicit. PI. IV f. 85. V.vmi.ufkn 

 Grunl.-Expedition 1891-93. IM. Ill tig. 15.) 



1899 June: 75 N. 20^ E. 



July: 74°— 75" \. 2(P— 18" W. 



Temperature: — O.i, mean of 3 ohs., ma.x. — ().:i. min. — O.c. 

 Salinity: 02. .;.-., mean of H obs., max. 34.29, min. 29. n.-,. 

 Plankton-type. Noted from K. and W. Greenland. Spitsbergen 

 an Kara Sea. — A//. 



Ostenfeld's dala used. 



