301 



Of these Stephanodisciis is absent in the Færoes ; of Pleurosigma, 

 Cymatoplciira and Campijlodisciis I have only occasionally niet with 

 a solitary specimcn; Amphora, Cocconcis and Rhoicosphcnia occur 

 at intervals; Siirirella and Epilhcmia are not rare. In Ihe Færoes 

 I have found a specimen of Siirirclla Lagerheimii which has hitherto 

 only been known from Lule-Lappmark. 



If we now ask, whether also in the Færoes there is a greal 

 difference in the gatherings from the dilTerent localities, then the 

 answer will be that taken as a whole the material is fairly homo- 

 geneons, sometimes, however, several species predominate in different 

 gatherings. 



In five gatherings labelled »waterfall« I have noticed the following 

 more conspicuous species: — 



Bosdalafos (Vaago), 3 gatherings. 



In No. 1: Ceratoneis Arens main part; Si/nedra delicatissima 

 mesokja, Fragilaria capiicina common; Diatoma tenue, Gomphonema 

 angiistata prodiicta, Cymbella affinis, Synedra Ulna not rare. 



In No. 2: Melosira varians main part; Nitzschia Palea, Cym- 

 bella ventricosa not rare. 



In No. 3: no Diatoms. 



Trangisvaag (Sydero). 

 Epithemia Zebra, Rhopalodia gibba common. 



Svartafos (S trom o). 

 Tabellaria floccnlosa. 



In gatherings from different heights. (The heights are parti- 

 cularly mentioned on the gatherings.) 



100 metres, 3 gatherings: Tabellaria floccnlosa, Anomoeoneis 

 brachysira, A. exilis, Frnstnlia viridnla, Achnanthes winntissima 

 cryptocephala. 



200 metres, 2 gatherings: Diatoma leune, Tabellaria floccnlosa, 

 T. fenestrata, Synedra Ulna, Fragilaria virescens, F. capncina, F. ca- 

 pncina lanceolata. 



2o0 metres, 3 gatherings: Tabellaria floccnlosa, Diatoma hiemale, 

 Achnanthes minntissinia cryptocephala, Fragilaria intermedia, F. mn- 

 tabilis elliptica. 



