ALGÆ ANTARCTICA. 251 
siphon feniculaceus, but the stem and branches are solid 
throughout, and the seeds are immersed endwise, in the 
substance of the branch. 
6. Adenocystis Lessonii, nobis in Flora Antarct. v.1, p. 179, 
t. 69, f. 9. 
Has. Cape Horn, Falklands, Kerguelen's Land, Lord Auck- 
land's Group, CampbelPs Islands, and in the sea at Cock- 
burn Island. 
7. Sphacelaria obovata, nobis; pusilla, stupa nulla, fronde 
cireumscriptione obovata, caule tenui articulato basi longe 
nudo in parte superiore ramis elongatis crebris erecto-pa- 
tentibus laxe pinnatis distichis ornato, apicibus sphace- 
latis. 
Has. St. Martin's Cove, Cape Horn, in deep water only. 
Fronds 1-11 inches high, very slender, articulate through- 
out. If our specimens be fully grown their outline is suffi- 
cient to characterise the species. 
8. Mesogloia linearis, nobis ; virescens, circumscriptione 
linearis, caule indiviso tenui, ramis abbreviatis flexuosis 
crebris alternis, ramulis subsecundis. 
Has. St. Martin's Cove, Cape Horn. 
Fronds 4-6 inches long, + line in diameter, pale olive green. 
Stem undivided, but densely covered throughout with short 
flexuous branches, which are from i inch to an inch long, 
and either naked or sparingly furnished with ramuli, which 
generally issue from their lower or outer margin in a secund 
manner. The filaments of the periphery are moniliform, and 
not much protruded beyond the gelatine. testes 6d 
RHODOSPERMEÆ or FLoRIDEX. 
9. Delesseria dichotoma, nobis in Flora Antarct. v. 1, p. 184. 
Has. Lord Auckland's Group. 
10. Ectocarpus geminatus, nobis ; cespite basi intricato oli- 
vaceo v. virescente, filis (majusculis) tenuibus ramosissi- 
mis apice liberis plumosis, ramis ramulisque patentibus 
oppositis Y. quaternis ultimis ! ré ibus, vite T RS 
