533 
the Colony of Western Australia. 
Of Antarctic species are Callithamnion simile and Delisia pulchra, both found 
by Dr. Hooker at Kerguelin’s Land. 
Representing the North Pacific, from S. Francisco to Kamtchatka, are Halo- 
saccion firmiim and H. hydrophora, identical, so far as my judgment goes, with 
the specimens from high northern latitudes. 
The characteristic vegetation of the Mediterranean Seas (of Europe and 
Mexico) is more largely developed, as shown by the 
Dictyota ciliata. 
Hydroclathrus cancella- 
tus. 
Asperococcus sinuosus. 
Chondria sedifolia? 
Polysip)honia breviarticu- 
lata. 
Polysiphonia Havanensis. 
ohscura. 
pennata. 
Dasya mollis. 
Wrangelia penicillata. 
Peyssonelia rubra. 
Helminthora divaricata. 
The following 27 are natives of the coasts of the 
of those of W. Australia : 
Chorda lomentaria. 
Dictyota dichotoma. 
Stilophora Lyngbycei, 
Asperococcus Turneri. 
echinatus. 
Sphacelaria cirrhosa. 
Ectocarpus siliculosus. 
Chondria dasyphylla. 
Polysiphonia obscura. 
Champia parvula. 
Laurencia obtusa. 
Gracilaria confervoides. 
Gelidium corneum. 
Helminthora divaricata. 
Plocamium coccineum. 
Rhodophyllis bifida. 
Spyridia filamentosa. 
Ceramium ruhrum. 
following list : — 
Liagora distenta. 
viscida. 
Halymenia Floresia. 
Dudresnaia coccinea. 
Crouania attenuata. 
Halimeda macroloba. 
British Islands, as well as 
Ceramium fastigiatum. 
gracillimum. 
Dudresnaia coccinea. 
Crouania attenuata. 
Callithamnion sparsum ? 
Codium tomentosum. 
Ulva latissima. 
Enteromorpha compressa. 
Calothrix ccBspitula ? 
I hope this outline may prove not uninteresting to botanists, and trust to 
be permitted, after my return to Europe, to lay before the Academy a more 
full memoir on this subject, accompanied by copious descriptions of the new 
species, and plates illustrative of the new genera, and some of the more remark- 
able species. 
W. II. HARVEY. 
Melbourne, September 11, 1854. 
3z 2 
