318 IC.IELLMAN, THE AhGJE OF THE ARCTIC SEA. 



Habitat. It has beeii found attached to an iron cohimn exposed to tlie waves 

 (investiens columnam ferreara maris undis expositam: Foslie). I have not seen it with 

 zoospores, but the speeimens distributed by Foslie in the above-mentioned collec- 

 tion of exsiccatai are near the stage when the zoospores are to be developed. These 

 speeimens having been collected in the beginning of September, the season for pro- 

 ducing zoospores raay be assumed to be the latter part of this month. 



Locality: The Norioegian Polar Sea: Finmarken at Gjesvser. 



Codiolum Pusillum (Lyngb.) Kjellm. 



in Foslie, Aret. Havalg. p. 12. Vaucheria pusilla Lyngjb. Hydr. Dau. p. 791. 



Descr. Codiolum pusillmn Poslie 1. c. 

 Fifj. » >' » »t. 2, fig. 1. 



Vaucheria pusilla Lyngb. 1. c. t. 22, fig. B. 



Exsicc. Codiolum pusillum Foslie in Wittr. et Nohdst. Alg. exsicc. N:o 457. 



Remark on this species. The Norwegian speeimens differ on some points from 

 those which are preserved in the herbarium of the Copenhagen Museum under the 

 name of Vaucheria pusilla by the determination of Lyngbye. In the former the club- 

 head is longer in proportion to the shaft than in the latter. For although these often 

 have the club-head longer than the shaft, it is never 1 '4 — 3 times longer, as is stated 

 by Foslie to be the case in Norwegian speeimens; it is also often about as long as the 

 shaft or even shorter. The present species is recognized from tlie other species of the 

 genus by its considerable length, by the shape of the club-head, and by the slight 

 thickness of the club-head in proportion to its length. 



Habitat. This alga clothes with a thin cover rocks exposed to the surge in the 

 lower part of the litoral zone. Like other species of this genus it grows gregarious 

 in large masses. 1 know only sterile speeimens collected at the end of August. 



Locality: The Norwegian Polar Sea: Finmarken at Gjesvasr. 



Codiolum Nord ens kiöldianum Kjellm. 



Spetsb. Thall. 2, p. 56. 

 Descr. et Fi<j, Codiolum Nordenskiöldiauum K.jellm. 1. c. et t. 5. fig. 1 — 9. 



Exsicc. » » » in Auesch. Alg. Scaud. exsicc. N;o 425 et Wittr. et 



NoBusT. Alg. exsicc. N:o 51. 



Remark oit the species. When I described the present alga from speeimens col- 

 lected at Spitzbergen, only one species of this genus was known with certainty, viz. 

 C. gregarium described by the founder of the genus, Al. Bkaun. The species from 

 Spitzbergen was so essentially difterent from this, that it could not but be regarded 

 as an independent species. However, another species of the same generic type was 

 described and delineated long ago, alhough this circumstance had escaped both Al. 

 Braun and myself. After the publication of my treatise on the algte of Spitzbergen 

 1 began to suspect that Lyngbye's Vaucheria inisilla was in fact a Codiolum, and this 

 suspicion was confirmed when some years ago I had the opportunity of examining 

 Lyngbye's collections of alga3 preserved in the Copenhagen Museum. This Codiolum 



