KONGL. SV. VT. AKADEMIENS HANDLINGAR. BAND 20. N:0 5. 323 
zone. It is scarce here, and nowhere occurs in great masses. It has been found 
both on exposed and sheltered coasts. I have collected specimens with hormogonia in 
development on the coast of Spitzbergen in July. 
Geogr. Distrib. Known from the Polar Sea north and north-east of the Atlantic. 
Its maximum of frequency is on the coast of Norway. Its most northern point is 
Fairhaven on the north-west coast of Spitzbergen, Lat. N. 79° 49’. 
Localities: The Norwegian Polar Sea: Finmarken at Maasé and Giesver, rather 
common and abundant. 
The Greenland Sea: rather common, but in small numbers on the west coast of 
Spitzbergen. 
The Murmaun Sea: local and searce on the west coast of Novaya Zemlya and 
Waygats. 
Calothrix Confervicola Ag. 
Syst. Alg. p. 70. 
Deser. et Fig. Calothrix confervicola Bory. et Tuur. Not. algol. 1, p. 8 et t. 3.. 
Syn. Calothrix confervicola Gosr, Algenfl. Weiss. Meer. p. 88. 
Halitat. Found attached to Phlwospora tortilis. 
Locality: The White Sea:  Solowetzki Isles (Cfr. Gost, 1. ¢.) 
Fam. OSCILLARIACEZ (Ac.) Norpst. 
Pl. Scand. p. 53. Oscillatorine AG. Syst. Alg. p. XXIV; lim. mut. 
Gen. Lyngbya (Ac.) THur. 
Nostoch. p. 4; Ag. Syst. Alg. p. XXV; char. emend. 
Lyngbya Semiplena (Haryv.) nob. 
Descr. et Fig. Calothrix semiplena Harv. Phyc. Brit. t. 309. Cfr. Symploca Harveyi THur. Nostoch. p. &. 
Habitat. Found growing on wood-work within the litoral zone in a sheltered 
locality, in small numbers. 
Locality: The Norwegian Polar Sea: Finmarken at Talvik, local, scarce. 
Gen. Oscillaria (Bosc.) Tuur. 
Nostoch. p. 4 et 7; Bosc. sec. Tuur. l. c. 
Oscillaria Subsalsa Aa. 
Oscillatoria subsalsa AG. Syst. Alg. p. 66. 
Deser. Oscillaria subsalsa Kurz. Spec. Alg. p. 246. 
Fiq. » » a @elab.»Phye., t,t. 425 he. 5. 
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