318 KJELLMAN, THE ALGA OF THE ARCTIC SEA. 
Habitat. It has been found attached to an iron column exposed to the waves 
(investiens columnam ferream maris undis expositam: Foslie). I have not seen it with 
zoospores, but the speeimens distributed by Fosiir in the above-mentioned collec- 
tion of exsiccatw are near the stage when the zoospores are to be developed. These 
specimens having been collected in the beginning of September, the season for pro- 
ducing zoospores may be assumed to be the latter part of this month. 
Locality: The Norwegian Polar Sea: Finmarken at Gjesver. 
Codiolum Pusillum (Lynes.) Kyun. 
in Fostre, Arct. Havalg. p. 12. Vaucheria pusilla Lynes. Hydr. Dan. p. 791. 
Descr. Codiolum pusillum Fostre |. e. 
Fig. ae » » Ge eae ireee ale 
Vaucheria pusilla Lynes. |. c. t. 22, fig. B. 
Eesicc. Codiolum pusillum Fosire in Wrrrr. et Norpsr. Alg. exsicc. N:o 457. 
Remark on this species. The Norwegian specimens 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 Lyncpyr. 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 '/,—3 times longer, as is stated 
by Fosrie to be the case in Norwegian specimens; it is also often about as long as the 
shaft or even shorter. The present species is recognized from the 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 specimens collected at the end of August. 
Locality: The Norwegian Polar Sea: Finmarken at Gjesver. 
Codiolum Nordenskiéldianum KJeuum. 
Spetsb. Thall. 2, p. 56. 
Deser. et Fig, Codiolum Nordenskidldianum Ksruim. |. ec. et t. 5. fig. 1—9. 
Eesice. » » » in ArEscH. Alg. Scand. exsicc. N:o 425 et Wirrr. et 
Nospst. Alg. exsicc. N:o 51. 
Remark on the species. When I described the present alga from specimens col- 
lected at Spitzbergen, only one species of this genus was known with certainty, viz. 
C. gregarium described by the founder of the genus, Au. Braun. The species from 
Spitzbergen was so essentially different 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 Aut. 
Braun and myself. After the publication of my treatise on the alge of Spitzbergen 
I began to suspect that Lynepyn’s Vaucheria pusilla was in fact a Codiolum, and this 
suspicion was confirmed when some years ago I had the opportunity of examining 
Lynesye’s collections of alge preserved in the Copenhagen Museum. This Codiolwm 
