8 Acta Societatis pro Fauna et Flora fennica, VIII, u. 2. 



94—95 Niemis gard, Isopaa, Kalvola socken, Tavastehus 

 Ian (Ta). 



9G Volkis by, Vesilaks, Tavastehus Ian (Ta). 



97 Paclasjoki, Tavastehus Ian (Ta). 



98 Niemis gard, Kuurila, Kalvola socken, Tavastehus Ian (Ta). 

 T. From Nyland (Nyl). 



99 Helsingfors, Berghall, collected 17 / 9 89 by R. Boldt. 

 U. From the vicinity of Abo (Ab). 



100 Abo, brackish water collected by F. Elfving. 



V. Old Baltic deposits, banks with Mytilus edulis (Foss B.), 

 obtained from the geological survay of Finland. 



101 Kunnarais, Gustafs socken. 



102 Stansvik, Helsingfors. 



103 Lexvall, Pojo. 



X. Diatomaceous earth (Foss). 



104 Sodankyla, Kemi Lappmark, obtained from Riksmuseum 

 of Stockholm. 



The number of gatherings, examined by me, is thus consi- 

 derable and collected from widely distant localities, so that the 

 following list of species may be regarded as fairly representing 

 the diatomaceous flora of Finland. Still I have some reason for 

 believing that future researches may considerably increase the 

 number of species, living in Finland. 



Several forms, of frequent occurrence in Sweden and Nor- 

 way, have not yet been found in gatherings from Finland, as for 

 instance, the whole group of the Nitzschiese is very poorely re- 

 presented in the catalogue, which can scarcely arise from any 

 other reason than that my materials have not been sufficiently 

 large. 



Diatoms, especially those living in fresh water, are as is 

 \\ ell known very cosmopolitan in their habitats. Nevertheless there 

 are certain species characteristic of alpine and arctic regions, 

 others of warmer climates. Among the species, found in Finland, 

 the following seem to inhabit only northern or alpine regions: 



