DIATOJIACEiE — ACHN'ANTHES, AllPHIPEOEA 281 



Diatomacese. 



ACHNANTHES TvENIATA Grun.^ 

 iCl. & Grux. Arct. Diatom. PI. I fig. 5.) 



1898 May : 60° N. 4° W. to 57^ N. 44° W. (sparingly). 

 June: S. of Iceland, very rare. 



1899 June: 75° N. 20" E. 



Temperature: — O.s. 



Salinity: 34.29 (evidently too high). 



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

 the Arctic Seas, the Baltic (at Bornholm, in the Bay of Finland and 

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



AMPHIPRORA HYPERBOREA Grux. 



(.1. paludosa c ? hijp. Grux. Cl. & Grun. Arct. Diat. PI. IV f. 85. Vanhoffe.v 

 Groiil.-Expedition 1891-93. PI. Ill fig. 15.) 



1899 June: 75° N. 20° E. 



July: 74°— 75" N. 20°— 18° W 



Temperature: — 0.4, mean of 3 obs., max, — O.s, min. — O.s. 

 Salinity: 32.35, mean of 3 obs., max. 34.29, rain. 29.95. 

 Plankton-type. Noted from E. and W. Greenland, Spitzbergen 

 an Kara Sea. — A//. 



Ostenfeld's data used. 



