fil s 



4. Pediastrum. 



Here in our present list we shall menlion P. duplex and P. lio- 

 rijamim only; as regards the varielies and forms cfr. Borgesen, 1. c. 

 pp. 241—242. 



5. Coelastrum cubicum Næg. 



Of the present species we have only seen 

 a very few coenobias. Fig. 147 shows one. 

 This species appears to come very near to 

 C. proboscidenm Bohlin. Lat. cell = 13 — 14 (i. 



Note: — Further, the following species, found in the 



Kig. 147. Coelastrum cubicum , , , , . .. ., . 



Ni'i ®*>l if b del plankton-samples, are not recorded in li orge s e n s Freshw. 



Algæ: Oocystis Någelii A. Br., Crucigenia rectangularis (A. 

 lir.) Chod., Raphidium Bramin Nag., Tetraeciron regulare Kiitz. 



II. DESMIDIACEAE. 



(by F. Borgesen) 



6. Cosmarium Phaseolus Bréb. var. achondra Boldt. 



Of this species a large form has been found which somewhat 

 resembled my lig. 13, tab. I in »Ferskvandsalger fra Østgrønland«, 

 p. 19; long. cell = 38 (* = lat.; and a smaller which was very much 

 like the one described and ligured by Borge in »Algologiska Notiser« 

 3—4 (Bot. Notiser, 1897, p. 212, tab. 3, fig. 2). 



7. Staurastrum lunatum Balfs, Borgesen, Freshwater Algæ, p. 233. 



8. Staurastrum jaculiferum West., Borgesen, 1. c. p. 232. Plate 

 VIII, fig. 1. 



9. Staurastrum crenulatum (Nægl.) Delp. Borgesen, 1. c. p. 234. 

 Plate VII, fig. lfi. 



10. Staurastrum Magdalenae nov. spec. Fig. 148. 



l-'il,'. 148. Staurastrum Magdalenae nov. spec. K0 /±. (F, B. del 



An elegant Staurastrum which occurred in the planklon-samples 

 Ironi Sorvaagsvatn and was fairly common in one of the samples 



