X here is already in existence a monograph of the diatoms 

 from Franz Josef Land by A. Grunow (Denkschr. d. K. K. 

 Akad. d. W. zu Wien mat. natw. Cl. XLVIII, 2, 1884). This 

 eminent diatomist had for examination some samples, dredged 

 from the bottom of tbe sea by tbe Tegethoif expedition. 

 This bottom-mud was found to contain, besides well-known 

 arctic marine species, a remarkable nnmber of forms, belonging 

 to types known from the Tertiary deposits of Archangelsk, 

 Mors etc., and doubtless derived from rocks of that age. 



A nnmber of freshwater species were found also, bnt on 

 examining the list published in Grunow's work, one is puzz- 

 led by the presence of forms whieh certainly do not live on 

 Franz Josef Land. There can be only one explanation of 

 this, namely that they have been transported by currents or, 

 more likely, by drifting ice from the European or Asiatic 

 continents. As such foreign forms I consider the following 

 species: 



Cocconeis lineata var., 



Cymbella gastroides, 



Gomphonema geminatnm var. hybrida, 



Epithemia tnrgida, 



Synedra nlna, > 



Stephanodiscus Niagarse, 



S. astreea var. spinnlosa, 



Melosira grannlata, 



M. lyrata. 



Of these forms Gomphonema f/eDiinutum var. hybrida is 

 known from Jenissey and Ochotch, which points to the Siberian 

 origin of these forms. 



Mr H. FiSHBR, member of the Harmsworth-Jackson ex- 

 pedition to Franz Josef Archipelago, 1896, bronght thence a 

 collection of samples containing freshwater diatoms. He also 



