44 ASTRID CLEVE, ON RECENT FRESHWATER DIATOMS. 



Pinnularia stauroptera Grun., microstauron Ehb., stomatophora 

 (tRUN., viridis Ehb., nohilis Ehb., Änomoeoneis hrachysira Bréb., 

 Stauroneis phoenicenteron Ehb., Cymhella hebridica (GtRég.) 

 Grun., naviculacea Grun., hderopleura Ehb., Eiinotia major 

 (W. Sm.) Rabh., robusta Ralfs, pentaglyphis Grun., lapponica 

 (tRUN., praerupta Ehb., lunaris (Ehb.) Grun., Fragilaria undata 

 W. Sm., Tahellaria fenestrata Kutz., Melosira distans var. 

 nivalis W. Sm. 



The sample from Ripas also contains for the most part 

 recent species not rare in Lule Lappmark in addition to a few 

 forms which I have not, yet at least, fonnd living there now. 

 These are: Pinnularia gentilis Donk., of whicli I have mea- 

 sured specimens 0,i8 mm. in length, 0,03 mm. in breadth, with 

 S to 8,5 striae in 0,oi mm. (7 striae in 0,oi mm. being the 

 iiumber stated by Cleve in Finl. p. 21); P. distinguetida Cl. 

 (striae 8 in 0,oi mm., instead of 5, as stated by Cleve 1. c. 

 p. 22); Cijmbella Ehrenhergii Kutz. (frequent); Cymatopleura 

 Solea (Bréb.) W. Sm., which is of special interest as be- 

 longing to a genus which is not represented in the recent 

 flora either of Lule Lappmark, or of Russian Lapland, 

 but has been fonnd in a fossil deposit of the latter country 

 (Cl. Finl. p. 58); Synedra capitata Ehb. (rare); Fragilaria 

 virescens var. exigua Grun. V. H. XLIV, 2, 3; F. mutabilis 

 var. elliptica Schumm. V. H. XLV, 15, 17 (frequent) and 

 Cyclotella antiqua Sm. (rare). 



