ALGZ ANTARCTICA, 265 
sent, has come under our observation, and we think it possi- 
ble that Agardh may have been deceived by a badly dried 
specimen in the compression attributed to the frond. 
36. Polysiphonia anisogona, nobis; atro-rubescens, flaccida, 
madefacta fragillima, frondibus ceespitosis setaceis articulatis 
equalibus vix attenuatis irregulariter ramosissimis, ramis 
ramulisque alternis v. subdichotomis erectis v. appressis, 
axillis angustissimis, articulis variis, inferioribus diametro 
sextuplo, superioribus duplo-triplove longioribus, ultimis 
sesquilongioribus v. quadratis, omnibus striis sex notatis, 
e tubulis 12 radiantibus tenuibus endochromaticis formatis, 
keramidia. . . . .? 
Has, Cape Horn and the Falkland Islands. 
Tufts extremely dense, 4-5 inches high, intricate. Articula- 
tions unequal in length, the lower ones very long, the upper 
very short, all marked with six straight or spiral striæ, being 
composed of twelve slender coloured tubes surrounding a 
central cavity. Colour dark red. The impossibility of re- 
moving without breaking the specimens of this plant from 
the paper on which they have been dried renders our account 
of the ramification imperfect, but we have no hesitation in 
pronouncing ita distinct species. In many respects it accords 
with the British Pol. atro-rubescens, but the substance is 
very much more frail and tender. 
37. Polysiphonia microcarpa, nobis ; atro-rubescens cæspitosa, 
frondibus tenuibus membranaceis flaccidis tenacibus oligo- 
Siphoniis equalibus vix attenuatis irregulariter repetite 
dichotomis, ramis ramulisque erecto-patentibus crebre divi- 
sis, articulis bistriatis e tubulis quatuor formatis, iis ramo- 
rum majorum diametro multiplo, minorum 3-4-plo, ramu- 
lorum 14 duplove longioribus, keramidiis pusillis ovatis 
breve pedicellatis. 
Has. Hermite Island, Cape Horn. 
Filaments 3-4 inches long, capillary, flaccid, but not fragile, 
densely tufted and branched in an irregularly dichotomous 
manner from the base, of nearly equal diameter throughout, 
Keramidia very small. Colour dark red. This nearly re- 
