40 ASTRID CLEVE, ON RECENT FRESHWATER BIATOMS. 



Fleurosigma attenuatum W. Sm. i 



acuminatum (KtJTZ.) Grun. 'f 



Cymhella Ehrenhergn Kutz. 

 affinis KtJTz. 

 prostrata Ralfs. 

 Roicosphenia curvata GtRUN. 

 Cocconeis Pediculus Ehb. 

 Achnanthes exilis Kutz. 



lanceolata (Bréb.) Grun. 

 Amphora ovalis Kutz. 

 Surirella elegans Ehb. 

 ovalis Bréb. 

 spiralis Kutz. 

 hiseriata Bréb. , 

 Cymatopleura elliptica W. Sm. 



Solea W. Sm. 

 Campylodiscus hihernicus Ehb. 

 Nitzschia Tryhlionella Hantzsch. 

 dubia "W. Sm. 

 dissipata (Kutz.) Grun. 

 sigmoidea (Ehb.) "W. Sm. 



linearis (Ag.) W. Sm. ^ 



Epithemia turgida Kutz. 



var. grauulata Grun. 

 Hyndmanii W. Sm. 

 Synedra Vaucheriae Grun. 

 radians Grun. 

 capitata Ehb. 

 Fragilaria construens v. venter Grun. 



mutahilis Grun. 

 Diatoma elongatum Lyngb. 

 vulgäre Bort. 

 tenue Kutz. 

 Cyclotella Meneghiniana Kutz. 

 Melosira varians Ag. 



arenaria Moore. 

 granulata (Ehb.) Ralfs. 



It is of special interest to compare the recent flora of 

 Lule Lappmark, so far as known at present, with that of the 

 Ancylus-sea, which, during a certain postglacial period filled 



