558 
Dr. W. H. Harvey’s Account of the Marine Botany of 
271. H ALOPHLEGMA PmssM, Sond. ! Very abundant on the reefs at Rottnest; also on Caulinia, 
&e. (63). 
272. Hanowia australis, Sond.! Fremantle, rare (56). 
273. Hanowia rohusta, n. sp, ; fronde (vix 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 arachnoidea, n. sp.; fronde compressa lata furcata v. dichotoma, filis arachnoideis, 
articulis primariis cylindraceis diametro 6-8-plo-longioribus. King George’s Sound, very 
rare (52). Frond 1-2 inches high, the segments \ to \ inch broad, compressed. Filaments 
much more slender than in II. australis, with much longer joints. 
Lasiotiialia, nov. gen. Frons filiformis, membranacea, ramosa, hirsuta, e filis longitudina- 
libus intertextis anastomosantibus, filoque central! major! contexta; filis periphericis 
externe fila callithamnoidea subsimplicia horizontalia libera emittentibus. Fructus? 
275. Lasiotiialia hirsuta, n. sp. ; Cape Riche, 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. Dcdresnaia coccinea, Bonn. I King George’s Sound, very rare (325). 
277. Crouania attenuata, (B. australis. On Zdstera, &c.. King George’s Sound (62). Much larger 
and less gelatinous than the British plant usually is, but scarcely otherwise different. 
278. Crouania vestita, n. sp. ; fronde ultra-setacea decomposite ramosissima membranacea (vix ge- 
latinosa), ramis ramulisque patentibus, omnibus ramellis densissime velatis, ramellis diva- 
ricato-multlfidis ; favellis solitariis reniformibus in ramulis minoribus inter ramellos im- 
mersis; tetrasporis sphairicis triangule divisis. Rottnest and King George’s Sound, on 
Zostera, &c. (338). Much more robust than C. attenuata, much less gelatinous, and not 
moniliform in any part of the frond. 
279- Dasyphila Preissii, Sond.! 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, involucre e filis 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 Ldbillardieri. It most resembles P. Phodocallis, H. {Ekodocallis elegans, 
Kutz.), but differs essentially from that species in the position and nature of the involu- 
cres, &c. 
