form. The suhsiancu is firmly cartilaginous, and the plant very imperfectly adheres to paper. Colour a livid
brownish-pui-ple.—The imperfect specimens referred to G. acicularis in Hook. Lond. Joum. vi. p. 407, probably
belong to this species, which is most nearly related to G. Teedii.
7. G ig a rtin a ? lanc eo la ta (Harv.); fronde e stipite brevi rix eanaliculato oriente plana carnosa
lanceolata v. obovata simplici v. in frondes plures consimiles partita, margine nuda v. sæpius plus minus
pinnato-ciliata, ciliis subulatis horizontalibus.
H ab. Georgetown, Gmn.
The specimens are not mature, and without fruit. It is possible, therefore, either that our plaut may be an
Iridæa, or some form of the protean G. radula. The fronds are about ö inches long, an inch or inch and half in
width, tapering much to the base, and either obtuse or acute at the apex. The margin in many is copiously furnished
with horizontal fringing processes 2 ov 3 lines long, and about ^ line iu breadth -. other specimens are
quite bare. B'e have seen one or two instances of cilia rising from the disc, showing aftmity with G. radula. The
straeture of the frond is that of Gigartina.
Gen. X CV n . IRIDÆA, Borg.
(Iforv', Coq. p. 103 (excl. sp.). J. Ag. Sp. Alg. ii. p. 250. Harv. Ner. Bor. Amer. ii. p. 178.)
1. Iridæa m ica n s? (Bory, Coq. p. 110. t. 13 et 13 bis. J . Ag. Sp. Alg. ii. p. 254).
H a b . Sandy Cove, B r. Lgall.
D ist r ib . Falkland Islands. Chili. Cape Horn. New Zealand.
Imperfect scraps, possibly referable to this species.
2. Iridæa fo liife r a (Harv.) ; fronde fusco-rubra membranacea ovata v. ovato-lanceolata basi cuneata
et in stipitem attenuata a margine foliifera, foliolis lanceolatis subpetiolatis, soris tetrasporarum punctiformibus
per totam frondem sparsis.
H ab. Georgetown, Gunn.
I am exceedingly unwilling to propose a new species in this troublesome genus, particularly on imperfect specimens,
yet I can hardly overlook tlie present plant altogether, and I know not any species of Iridæa with which
it can be associated. In habit it so much resembles some specimens of Rhodymenia polymorpha that, without testing
it microscopically, it might easily be passed over for that species. The colour is a rather full red, somewhat
brownish or purplish ; the surface, when dry, slightly lustrous. The outline of the frond, as in aU the geuus, is
very variable, its most striking peculiarity being the marginal leafy lobes. Sori very numerous, immersed in tho
substance.—Me possess fraginentaiy specimens of other Tasmanian Iridæa, too imperfect for description.
3. Iridæa polycarpa (Harv.) j fronde intense rubra longissima lanceolata v. ovato-lanceolata
simplici integerrima, margine incrassato, basi cuneata et in stipitem filiformem tenuem vix canaliculatuin
attenuata, cystocarpiis numerosissimis per totam frondem sparsis.
H ab. Tasmania, C. Stuart.
Perhaps this may be the cystocarpic state of the preceding, but our numerous specimens are all quite simple,
without lateral foliations. The colour is a deep blood-red. The substance is thin, much thinner than in I. lamina-
rioides, to which tlie frond approaches in form. Tbe cystocarps are of large size, and very densely scattered over
the surface ; they aj'e nearly spherical, and prominent on both surfaces of the frond. The frond is from 1-3 feel
iu length, and from l-|-6 inches in width.
Gen. XCVIII. EPYMENIA, Kütz.
(Kütz. Sp. Alg. p. 787. J. Ag. Sp. Alg. ii. p. 219.)
1. Epymenia membranacea (Harv.) ; fronde stipitata ' ilabellatim expansa repetite dichotoma
membranacea, segmeutis inferne semicostatis cuneatis, superioribus linearibus apice obtusis v. subacutis,
cystocarpiis in sporopliyliis subbinis.— Earv. Phyc. AusPr. t. 89.
H ab. Georgetown, W. H. I ! Southport, C. Stuart.
A smaller <and much thinner and more membranous plant than P. obtusa, which in all other respects it nearly
resembles. The apices are perliaps less obtuse. There are commonly two cystocarps on each fertile leaflet in the
only fruiting specimen seen.
Gen. XCIX. ÇHRYSYMENIA, J. Ag.
(J. Ag. Alg. Medit. p. 105. Sp. Mg. ii. p. 209. Harv. Ner. Bor. Amer. ii. p. 187.)
1. C h ry sym e n ia o b o v a ta (Sond. Alg. Preiss. p. 2 9 ; Harv. Ner. Austr. p. 7 7 ; Harv. Phyc.
Austr. t. 10).—Rhabdonia ? globifera, J. Ag. Sp. Alg. ii. p . 355 ? ?
H ab. Stones at low-water mark, above Georgetown.
D ist r ib . West and south coasts of Australia.
I am at a loss to discover why Professor Agardh should have placed this plant in Rhabdonia, supposing that
we are speaking of the same species. To me it seems nearly allied, not merely in habit but in structure, to
Ch. uvaiia.
Gen. C. CHYLOCLADIA, Grev., .1. Ag.
(J. Ag. Sp. Alg. ii. p. 380. Harv. Ner. Bor. Amer, ii. p. 185.)
1. Ch ylocladia c la v e llo sa (Grev. ; Harv. Man. p. 71 ; Phyc. Brit. t. 114 ; J . Ag. Sp. Aig. ii.
p. 366).—Fucus clavellosus. Turn. Eist. i. 3 0 ; E. Bot. t. 1203.
H ab. Georgetown, rare, Gunn, JF. Archer. Sullivau’s Cove, Br. Lyall.
D istiub. Coasts of Europe from Norway to Spain. Falkland Islands.
Gen. CI. HALYMENIA, Ag.
(J. Ag. Sp. Aig. ii. p. 197- Har\'. Ner. Bor. Amer. ii. p. 192.)
1. Ha lym en ia ? saccata (Harv.); fronde rosea tereti (?) saccata succo repleta pinnatim v. bipin-
natim composita, pinnis pinnulisque suboppositis simplicibus saccatis basi eonstrictis apiee obtusis,
tetrasporis sparsis, cystocarpiis in ramis immersis infra stratum periphericum suspensis.
H ab. At Georgetown, Archer.
Frond a foot long, and as much iu the expansion of the brancbes, bipinnate, some of the pinnnlæ fumished
with a thh-d series of pinnules, Tiie main branches are nearly half an inch or sometimes more in diameter, the
pinnulæ 2-3 lines ; both are simple, saccate, much constricted at their insertion, and tapering upwards to a blunt
point. Cgstocarps suspended in a network under the exterior layer, which is composed of moniliform filaments,
formed of minute coloured cells. Colour rosy-red. Substance delicately membranaceous. It most closely adheres
to paper in di-jnng, and appears to liave been filled, when fresh, with abundance of loose gelatine.
This beai-s so close a resemblance to Chysymenia Entei-omorpha, Harv. Ner. Bor. Amer. ii. p. 187, anti also
to the Bindera splachnoides of Western Australia, that, without microscopic examination of the structure of tlie
froud, or hy the fruit, these three plants cannot well be distinguished !
Geu. C II. NEMASTOMA, J. Ag.
(J. Ag. Alg. Medit. p. 89. Sp. Alg. ii. p. 162. Gymnophloea, Kiiti,
1. Nemastoma Feredayoe (Harv.) ; stipite tereti ramosa (v. simplici), ramis in basi cuneata frondis
cito deliquescentibus, fronde ilabelliforrai coiupresso-plana rosea repetite dichotoma, segmentis sensim