ALGOLOGICAL NOTES. 



As to be seen from this list, the plankton was rich and varied. 

 Malloinonas acaroides and Dinobryon divergens, Staurastruîyi 

 lunatum var. planctonicum, St. paradoxum occurred in great 

 abundance. 



Other Algæ, which were quite frequent, were Dinobryon 

 stipitatuni, Eudorina elegans, Crucigenia irregularis, Xan- 

 thidium antilopœum, Arthr odesmus crassus and Staurastrum 

 cuspidatum var. maximum. 



()[ the Desmids, Pleurotœnium Ehrenbergii deserves special 

 mention as it occiu'red in the form described by Messrs. West 

 from Loch Fadaghoda. The length was 510 ^tt, the breadth 40 ^<. 



On the whole, the plankton was of a striking Caledonian 

 type, which was somewhat surprising to find so far to the North. 



The zooplankton was represented almost only by Anurœa 

 aculeata, which occurred in prodigious quantities. Only a few 

 mdividuals of Copepoda, of Bosmina obtusirostris, and of 

 Notholca longispina were present. 



I have figured a form of Dinobryon divergens, approaching 

 the variety pediforme, a young colony of Crucigenia irregu- 

 laris, and a form of Cosmarium depressum, 



III. The Germination of the Zoögonidia of 

 Stigeoclonium tenue. 



In the past, several authors have reported on the germina- 

 tion of the zoögonidia of Stigeoclonium-spec'ies, and this small 

 contribution adds no new facts of importance to those already 

 known. 



I think, however, that the observations I have made on 

 the species will prove to be of some interest, as they are illu- 

 strated with carefully drawn figures. 



On the 22nd of February this year (1920), I collected speci- 

 mens of Stigeodonium tenue (Ag.) Kuetz. from near Øraker in 

 the neighbourhood of Christiania. 



