240 



242. A. aciculiferus Lagerh. 

 Lat. s. acul. — 25 /^. 

 Svnrtafoselv ncar Hojvig (Str.). 



243. Oocystis solitaria Witlr. 

 Of'ten found in the collections. 



244. Nephrocytium Naegelii Grun. 

 Lat. = 16 fi. 



Thorshavn (Str.); Skopen and Grothusvatn (S an do). 



245. Raphidium polymorphum Fres. 



Rather conimon; Rostrup (Fær. Fl. p. 89) mentions having mel with 

 it »amongst Spliagnum on Stromo«. 



246. Scenedesmus bijugatus (Turp.) Kiitz. 



Tliorshavn (Str.); and Tværaa (Sj'd.). In Phuikton from the hirge 

 hike near Ejde (Ost.). Has been already found by Rostrup (Fær. Fl. p. 90). 



247. S. denticulatus Lagerh. 



Stockh. Pediastr. p. 61, tab. 2, fig. 13—16. Cfr. var. linenfns 

 West: Algæ of West Ircland p. 193, tab. 18, lig. 7. 



The specimens from the Færoes are a liltle larger than indicated 

 by Lagerheim. 



Long. cell. = 19 /t; lat. — 8 /i. 



Gliversrejn near Thorshavn (Str.). 



248. S. quadricauda (Turp.) Bréb. 



Common in the collections. Also found in Plankton from the lake 

 near Ejde (Ost."!; and Sandsvatn (San do). 



Var. hoprida Kirch. 



Vidcrejde (Vid.). 



249. S. obliquus (Turp.) Kiitz. 



Rather common in the collections. In Plankton from Sandsvatn 

 (Sand 6). 



250. Polyedrium enorme (Ralfs) De Bary. 



Viderejde (Vid.); in Plankton from the large lake near Ejde (Ost.). 



251. P. minimum A. Br. 



Reinsch Fam. Polyedriarum in Notarisia 1888, p. 499. 



Lat. = 8 /<. 



Very common in a gathering of algæ from Skopen (San do). 



252. P. tetraetricum Nagl. f. minor. 

 Reinsch 1. c. p. 505. 



