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



271. Halophlegma Preksit, Sond.I Very abundant on the reefs at Rottnest; also on Caulinia, 



&c. (63). 



272. Hanowia o»rf;-a/«, Sond. ! Fremantle, rare (56). 



273. Hanowia robusfa, n. sp. ; fronde (vi.x evoluta) compressa lata ; fills setaceis, articulis prima- 



riis ovoideo-cylindraceis ad genicula contractis diametro 2-3-plo-longioribus, endochromate 

 ampla. Fremantle, very rare ( ). My specimens are immature. The filaments are much 

 more robust and more laxly woven than in H. australis. 



274. Hanowia ai-achnoidea, n. sp. ; fronde compressa lata furcata v. dichotoma, fills arachnoideis, 



articulis primariis cylindraceis diametro 6-8-plo-longioribus. King George's Sound, very 

 rare (52). Frond 1 -2 inches high, the segments 4 to J inch broad, compressed. Filaments 

 much more slender than in H. a2tslralis, with much longer joints. 

 Lasiothalia, nov. gen. Frons filiformis, membranacea, ramosa, hirsuta, e fills longitudina- 

 libus intertextis anastomosantibus, filoque centrali majori conte.xta; fills periphericis 

 externe fila callithamnoidea subsimplicia horizontalia libera emittentibus. Fructus? 



275. Lasiothalia hirsuta, n. sp. ; Cape Eiche, very rare (321). I found only two or three speci- 



mens. The largest is about 6 inches long, irregularly divided, with lateral branches and 

 slender filiform ramuli. Every part of the plant is clothed with short, simple, or slightly 

 branched, horizontal, jointed hairs. There is no trace of gelatine, and the plant but slightly 

 adheres to paper. 



276. Dddresnaia eoccinea, Bonn. 1 King George's Sound, very rare (325). 



277. Crouania attemiata, fi. australis. On Zostera, &c.. King George's Sound (62). Much larger 



and less gelatinous than the British plant usually is, but scarcely otherwise different. 



278. Crocania vestita, n. sp. ; fronde ultra-setacea decomposite ramosissima membranacea (vix ge- 



latinosa), ramis ramulisque patentibus, omnibus ramellis densissime velatis, ramellis diva- 

 ricato-multifidis; favellis solitariis reniformibus in ramulis minoribus inter ramellos im- 

 mersis; tetrasporis spha;ricis triangule divisis. Rottnest and King George's Sound, on 

 Zostera, &c. (338). Much more robust than C. atteimala, much less gelatinous, and not 

 moniliform in any part of the frond. 



279. Dasyphila Preissii, Sond.I On the stems of Fucoidece, Garden Island, common (149). 



280. Ptilota coralloidea, J. Ag. Garden Island, Rottnest, and King George's Sound, common 



(91)- 



281. Ptilota sp. King George's Sound (92). Possibly only a variety of the last, with articu- 



lated ramelli. 



282. Ptilota striata, n. sp. ; fronde ancipiti siccitate transversim ruguloso-striata decomposite 



ramosissima, ramis majoribus sparsis alterne divisis vix pinnatis, minoribus linearibus 

 pectinato-pinnatis, pinnulis subulatis alternis simplicissimis; favellis minimis ad latus su- 

 perius pinnularum pedicellatis involucratis, involucro e fills callithamnoideis multiseriatis 

 composito ; tetrasporis ad processes proprios ramosos e lateribus pinnularum emissis. 

 Rottnest, not uncommon (240). A most distinct and beautiful species with the habit of 

 Phacelocarpus Lahillardieri. It most resembles P. llhodocallis, H. {^Rhodocallis eleijans, 

 Kiitz.), but differs essentially from that species in the position and nature of the involu- 

 cres, &c. 



