ALGJE ANTARCTICA. 263 
species of this difficult genus, varies extremely in all its 
characters, 
28. Iridæa micans, Bory. 
DB. ciliolata, nobis; stipite brevi cartilagineo cuneato ciliato- 
dentato mox in frondem ovato-lanceolatam simplicem 
desinente, fronde latissima basi ovata apice obtusa v. 
acuta v. emarginato-bifida membranacea vel cartilagi- 
neo-membranacea rubra plana, nitente levi margine vix 
undulata. 
Has. St. Martin's Cove, Cape Horn. 
Fronds 6-12 inches long, 3-6 broad. This is a distinct 
looking form, but we fear not entitled to rank as a species. 
The common state of J. micans was found in plenty at the 
Falkland Islands, and accompanying the present indivi- 
duals. 
29. Gigartina divaricata, nobis in Flor. Antarct. v. 1. 
Has. Campbell's Island. 
30. Chondrus tuberculosus, nobis in Flor. Antarct. v. 1. 
Has. Lord Auckland’s Group. 
31. Halymenia latissima, nobis in Flor. Antarct. v. 1. 
Has. Lord Auckland's Group and Campbell's Island. 
32. Dumontia cornuta, nobis in Flor. Antarct. v. 1. 
Has. Campbell's Island. 
33. Rhodomela? comosa, nobis; ramosissima atro-rubes- 
cens, caule cylindraceo frondem percurrente ramis alternis 
crebris onusto, ramis elongatis pluries alterne divisis 
erecto-patentibus sensim attenuatis basi subangustatis 
cylindraceis, ramulis ultimis setaceis acutis abbreviatis vagis, 
capsulis ovatis breve pedicellatis. : 
var. B. fibrillifera ; fronde tenuiori laxius ramosa, apici- 
bus fibrilliferis. 
Has. Both varieties common at the Falkland Islands. 
Stem cylindrical, 6-9 inches long, in var. a from a line to 
nearly a line in diameter at base, in var. 8 very slender, 
either undivided, or branching from the base into 3-4 
Principal stems, which are throughout their length thickly set 
With minor branches, again and again similarly divided. All 
