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EXPLANATION OF PLATES 
All figures are photographs of dried specimens, 4/; nat. size. 
Plate V. 
. Polysiphonia orthocarpa, from Amtoft Reef, Limfjorden. 
. Polysiphonia elongata f. Schuebelerii, from the Great Belt north of Langeland (UF). 
. Polysiphonia elongata f. baltica, from YC, east of Bornholm, 24,5 meters’ depth. 
Plate VI. 
. Polysiphonia violacea, from Hirsholm 11 meters’ depth showing secondary axillary shoots 
and torsion. 
. Rhodomela subfusca f. abyssicola, from dQ south of Lyø 22 m, June; fig. 3 with tetra- 
sporangia. 
Plate VIT. 
. Delesseria sanguinea, from N.E. Reef by Hirsholm, July. 
— , from Ojet (Bw) 20 m, May 21st. With cystocarps. 
— , from VG, north of Moens Klint, 17 m, May 28th. 
— , from YC, east of Bornholm, 24,5 m, July. 
. Membranoptera alata, from Læsø Trindel, April, Børgesen. 
— , from Frederikshavn, outside of harbour, May. 
, from Præstebjergs Rev, east of Falster, 7,5 m, November. 
