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



carpiis per discmn frondis sparsis; tetrasporis in pinnis nidulantibus zonatim divisis. King 

 George's Sound (93) and Kottnest (142). A pretty little species, with the habit of Hemi- 

 neura frondosa in miniature; and readily known by its scattered, not marginal, cystocarps. 



232. Ehodtiienia corallina, Grev. King George's Sound and Rottnest (85). 



233. RnOBYUEmA (Acropeltis) anstralis, Sond. Abundant at Rottnest (144). I have gathered both 



kinds of fruit. The cystocarps are in every respect similar to those of liJiocli/mema. 



234. Ehodtjienia (Acropeltis) phyUophora, n. sp. ; caulescens; stipite alato ramoso, ramis in frondes 



pergamenas crassas inferne costa valida evanescente donatas dichotomo-multifidas abeunti- 

 bus ; segmentls linearibus cuneatisve, margine incrassato piano ; soris maculam depressam 

 infra apicem frondis forraantibus. Hah. Rottnest (238). Frond 1-2 feet high, much 

 branched; segments \-\ inch broad. This is probably the same as Acropeltis phyUophora, 

 H. and H., but I have not had the opportunity of comparing it with that plant. 

 23o. Rhodymenia data, n. sp. ; caulescens; stipite plano-compresso subcanaliculato ramoso, ramis 

 in frondes pergamenas inferne subcostatas pinnato-dichotomas abeuntibus ; rachide flexu- 

 osa, segmentis alternis linearibus angustis dichotomis ereoto-patentibiis obtusis, axillis ro- 

 tundatis. Rottnest, rare (233). A noble species, two feet high, and much branched, very 

 distinct from B. fiabdlifolia, with which alone it can be confounded. 



236. Rhodymenia? oJ(!wato, Sond. Rottnest and Garden Island, common (143). I have not ex- 



amined the cystocarps minutely, and my specimens are not now accessible. I think it 

 scarcely of this genus. 



237. Ehodymenia? rosea, n. sp. ; stipite brevi compresso mox ampliato, fronde basi cuneata tenui- 



membranacea flaccida rosea subpalmatifida, segmentis lato-cuneatis varie lobatis, lobis acutis. 

 Fremantle, G. Clifton, Esq. I have seen only a single immature specimen, sufficient to estab- 

 lish a distinct species, but not to fix the genus. It may possibly be a Rhodophyllis. A 

 transverse section shows a double row of large empty cells in the medullary layer, and a 

 thin cortical layer of minute cellules. 

 Areschougia, nov. gen. (Ilarv. 3IS. Herb. T. C. D.) Frons linearis, compressa, immerse 

 costata, distiche ramosissima, e filo centrali articulate et stratistribuscellularumconstituta; 

 stratum medullare e fills articulatls longitudinalibus anastomosantibus laxe intertextis, inter- 

 medium e oellulis rotundis majusoulis pluriseriatis, corticate e oellulis minimis verticalibus 

 formatum. Cystocarpia fronde immersa, inter fila strati intermedii suspensa, reticulo filo- 

 rum velata, carpostomio demumaperta, fila sporifera a placenta centrali emissacontinentia; 

 sporse subrotundte, seriatte. Genns Rhabdonice ■pioximum; diflfert filo centrali articulate, 

 et habitu. Dixi in honorem Prof. J. E. Aeeschoug, Upsaliensis, Algologi eximii. 



238. AREscHonoiA australis. Halymenia anstrulis, Sond. PI. Preiss. Phacelocarpus australis, Sond. 



But. Zeit. 184.5, p. 55. Areschougia Ugulata, Hai-v. MS. olini in Herb. T. C. D. Common at 

 Rottnest (173). The structure of the frond is very similar to that oi Phacelocarpus ; that of 

 the cystocarp to Ehabdonia. 



239. Areschodoia Laurencia, Harv. in Herb. T. C. D. Thamnocarpus ? Laurencia, H. andH. olim. 



Rottnest, rare (236). I have seen no fruit; but the structure of the frond nearly agrees 

 with that of A. australis, and the habit is not dissimilar. 



240. Rhabdonia ? Sonderi, J. Ag. Cast ashore at Fremantle (139). I liave not seen fruit. 



