8 KAARE MUNSTER STRØM. 



The lake is situated only a few feet above the level of the 

 sea, the Northern Latitude being the same as mentioned for the 

 other collections, about 71° — The samples, (three in number) 

 were taken by means of Apstein's quantitative net, of finest 

 miller's silk, used both vertically, and as a tow-net. 



The indication of the frequency of the species in the fol- 

 lowing table is as usual (ccc, cc, c, +, r, rr.) 



T^y „ ^ Plankton Table. 



limgelmtæ. 



Mallomonas acaroides Perty ccc 



Binohryon divergens Imhof cc 



— stipitatum Stein + 



Besmidiaceæ. 



Gonatozygon monotœnium De Bary r 



Pleurotœnium Ehrenbergii (Ralfs) De Bary forma . . rr 



Micrasterias papillifera Breb r 



Cosmarium contractum Kirchn , r 



— depressum (Naeg.) Lund & var. achondrmn 

 (Boldt) W. & G. S. West r 



— iinpressulum Elfv rr 



Xanthidium antilopœum (Breb ) Kuetz -i- 



— — var. triquetrum Lund .... r 

 Ärthrodesmus crassus W. & G. S. West. c 



— Incus (Breb.) Hass. r 



Staurastrum Arctiscon Ehrbg rr 



— cuspidatum var. maximum W. & G. S.West + 



— dejedum Breb r 



— jaculiferum W. West r 



— lunatuni var. planctonicum W. & G. S. West. cc 



— paradoxum, Meyen cc 



Hyalotheca dissiliens (Sm.) Breb rr 



Other Chlorophyceæ. 



Eudorina elegans Ehrbg + 



Crucigenia irregularis Will k c 



