ALGZ ANTARCTICA. 249 
stand, a stout octavo volume, full of wood-cuts, illustra- 
tiveof the Natural Orders. Such a book was much needed 
by the botanical student, and few persons are so competent 
to the task as Dr. Lindley. 
ALGÆ Antarctica, being characters and descriptions of the 
hitherto unpublished species of Ava, discovered in Lord 
Auckland’s Group, Campbells Island, Kerguelen’s Land, 
Falkland Islands, Cape Horn and other southern circumpolar 
regions, during the voyage of H.M. discovery ships ** Erebus” 
and “Terror; by Dr. J. D. Hooker and W. H. Harvey, 
Esq. M.D. 
MELANOSPERMEZÆ or FUCOIDES. 
1. Durvillea Harveyi, Hook. fil.; radice e fibris crassis demum 
anastomosantibus constante, stipite perbrevi valido com- 
presso in laminam subsolidam coriaceam apice laciniatam 
gradatim attenuato. 
Has. Hermite Isl., Cape Horn and the Falkland Islands. 
A very distinct species, which may readily be recognised 
by the fibrous root, that of D. utilis being always scutate. The 
frond is of a much thinner texture (though covered with fruc- 
tification) and never, even in its largest state, has been found 
incrassated or filled with transverse inflated cells ; it often at- 
tains a length of six feet and upwards. 
2. Desmarestia chordalis, nobis ; fronde coriaceo-cartilaginea 
compressa anguste lineari tri-quadripinnata, pinnis pin- 
nulisque lengissimis oppositis distantibus apice longe nudis, 
pinnulis sæpe alternis elongatis inermibus chordiformibus. 
Has. Christmas Harbour, Kerguelen’s Land. 
This forms a verdant mass under the sea in 2-5 fathom water, 
growing on the rocks. The fronds are several feet in length, 
a line or a line and a half in diameter in the principal stems, 
and half a line in the pinnæ. The long whip-like naked apices 
of the branches are a very striking specific character, — — 
3. Desmarestia Rossii, nobis; fronde coriaceo- -cartila- 
