556 Dr. W. H. Harvey's Account of the Marine Botany of 



multifidis margine integris t. parce lobatis, lobulis deltoideo-subulatis acutis. King George's 

 Sound, rare (341). Frond broader and more dichotomoiis than in the preceding, spreading 

 from a central point like a fan. 



250. Chrtstmenia ohovata, Sond.l King George's Sound and Eottnest (104). I have seen no 



fruit, and can throw no light upon the genus. But J. Agardh must have got hold of some- 

 thing very different, or he would not refer this plant to Rhabdoiiia, to which it bears nei- 

 ther internal nor external resemblance. 



251. Chylocladia .secMnrfffi, Ilook. and Harv. ! King George's Sound (340). I have not compared 



with New Zealand specimens; but refer this plant from memory and description. 



252. Chtlocladia opuntioides, n. sjp.; fronde (6-10 uncias alta) inferne cartilaginea solidescente 



obsolete constricta dichotoma, superne di-tri-chotoma articulato-constricta membranacea 

 succo aquoso repleta, ramulis ad genicula verticillatis articulatis ; articulis ramorum puncto 

 af&xis (cito in aqua dulci sejunctis) ovali-oblongis basi et apice obtusissimis; cystocarpiis 

 . . . Eottnest, Fremantle, and King George's Sound (192). Either this or the follow- 

 ing appears to be the " Ch. articitlata" of Australian botanists, but both differ essentially 

 from each other, and from the European species so called. The present is remarkable for 

 the rapidity with which its branches and ramuli fall to pieces, without dissolving, when 

 thrown into fresh water. An hour or two is sufficient to denude a large specimen, leaving 

 nothing behind but the cartilaginous main stem. The colour is a beautiful rosy purple. 



253. Chylocladia Cliftoni, n. sp. ; fronde (6-8 uncias longa) tenui membranacea succo gelatinoso 



repleta rosea e basi articulato-constricta trichotoma v. umbellatim ramosa; ramis ternis 

 fere ad singula genicula egredientibus; ramulis sape numerosis; articulis inferioribus cla- 

 vatis diametro 4-5-plo-longioribus, superioribus obovatis, ultimis ellipsoideis utrinque 

 obtusis. Fremantle, G. Clifton, Esq. (265). A much more delicately membranous plant 

 than Ch. articulata, of larger size, closely adhering to paper in drying, and soon dissolving 

 in fresh water. It is nearly allied to Ch. Millleri, Sond. ! but quite distinct. 



254. HALOSACClON_^rmU7?!, Post, and Rup. ? Fremantle, common (135, a). 



255. Halosaccion hydrophora, Post, and Rup. ? With the preceding; also at King George's Sound 



(135, /3). These are very similar In form to the Kamtchatkan plants to- which I refer them; 

 but they closely adhere to paper, and are filled, when recent, with very slimy mucus. 

 Both produce cystocarps. I am doubtful, whether as species they are sufficiently distinct 

 one from another. 



256. Haltmenia Floresia, Ag. Fremantle (314); also found by G. Clifton, Esq. 



257- Halymenia Kalli/nicnioides, n. sp. ; fronde plana gelatinoso-membranacea foliacea informi 

 varie lobata et sinuata, margine glanduloso, laciniis acutis, cystocarpiis sparsis. Cast ashore 

 ■ at Fremantle, rare (174). This has the habit oi KaUymenia, but exactly the structure of 

 Hali/menia. 



258. Gelinaria ((^yoiVZea, Sond. Fremantle and King George's Sound (136). The structure, as 

 already stated by Kiitzing, is very similar to that of Halymenia. The only difference is, that 

 in Gelinaria the peripheric membrane is very thick and fleshy, composed of two or three 

 rows of small polygonal cells, protected externally by a thick stratum of vertical, moniliforra 



