K0N6L. SV. VET. AKADEMIENS HANDLINGAR. BAND 20. N:0 5. 145 



attached to the alg£e together with which it grows, as Laminariacece , Delesseria sinuosa 

 Ptilota pectinata a. o. It is most vigorously and typically developed on exposed coasts, 

 but enters also into deep bays, where however not seldom it assumes an appearance 

 very different from the pelagic form, I have figured such a specimen from the interior 

 of Altenfjord on the coast of Finraarken tab. 12. Sometimes it is found gregarious in 

 quite large masses, but in general it constitutes a subordinate element in certain for- 

 mations, such as those of the Laminariacece and Corallineas. At Nordlanden it bears 

 sporocarps in July and August, on the west coast of Novaya Zemlya at the end of 

 June and in July, at Spitzbergen in August. I have taken individuals with tetraspo- 

 rangia at Novaya Zemlya in July. 



Geogr. Distrib. It belongs to the Atlantic as well as the arctic region of the 

 Polar Sea, being widely spread within the latter. However, it reaches its maximum of 

 frequency in the northern part of the Norwegian Polar Sea and in the White Sea. 

 The most northern locality where it is known with certainty to grow, is the group of 

 islands on the north-western coast of Spitzbergen, Lat. 79° 50' N. 



Localities: The Norwegian Polar Sea: Nordlanden, pretty common and abundant; 

 Finmarken, pretty common, abundant at Maaso, Gjesvser and in Magero sound, scarce 

 at Talvik. 



The Greenland Sea: scarce and local on the coast of Spitzbergen. 



The Murman Sea: Russian Lapland and the coast of Cisuralian Samoyede-land; 

 the west coast of Novaya Zemlya, local but, pretty plentiful. 



The White Sea: common and abundant. 



Baffin Bay: in several places on the western coast of Greenland, as Tessarmiut, 

 Lichtenau, Julianeshaab, Friderichshaab, Godthaab, Egedesminde, Whale Islands; pro- 

 bably pretty abundant everywhere. 



Gen. Euthora J. G. Ag. 



Alg. Liebra. p. 11; Spec. Alg. 2, p. 383. 



Euthora cristata"^(L.) J. G. Ag. 



1. c. Pucus cristatus Lin. in Turn. Hist. Fuo. 1, p. 48. 



f. typica. 

 Descr. Euthora cristata J. G. Ag. Epicr. p. 360. 

 Fig. Rhodyraenia cristata Harv. Phyc. Brit. t. 307. 

 Exsicc. Euthora cristata Abesch. Alg. Scand. exsicc. N;o 308. 



f. angustata Lyngb. 



Hydr. Dan. p. 13. 

 Descr. Sphferococcus cristatus /? angustatus. Lyngb. 1. c. 



Syn. Euthora cristata J. G. Ag. Spetsb. Alg. Progr. p. 3; Bidr. p. 11; Gronl. Alg. p. 111. 

 )) " Croall, pi. Disc. p. 459. 



19 



K. Vet. Akad. Handl. Bd 20. N:o f). '-'' 



