fJie Colony of Western Australia. 545 



appressis, axillis angustissimis; adulta apice paniculata, ramis quoquoversum egredientibus 

 elongatis patentibus, ramulis alternis spiraliter insertis corymboso-multifidis; ceramidiis 

 ovatis sessilibus. Clothing the borders of reefs laid bare at low water, and covering wide 

 spaces, Kottnest (210). Nothing can be more dissimilar in ramification than the young 

 and the full-grown plant. 



1 30. Laurencia sp. . . . On rocks near low- water mark, King George's Sound (7). I have not 



determined this species. 



131. Laurencia Tasmanica, Hook, and Harv. Abundant on stones in shallow water in Princess 



Royal Harbour, King George's Sound (5). 



132. Laubencia elatUy Harv. Ner. Austr., t. 33. Garden Island, Eottnest, and King George's 



Sound (125). 

 13.3. L-ACRENCIA Greiiilkana, n. sp. ; purpureo-coccinea; fronde complanata eximie disticha decom- 

 posito-pinnata; pinnis in rachide stricta alternis erecto-patentibus; pinnulis oblongis inciso- 

 crenatis v. pinnatifidis, inferioribus minutis glandula-formibus, fructiferis . . . Abundant 

 on the under surface of flat-topped reefs, near low-water mark, Eottnest (196). Allied to 

 L. pinnatijida, but of softer substance, and very different colour. When fresh it is a beauti- 

 ful rosy carmine, partially preserved in drying. I name it in honour of Dr. Greville, the 

 first reformer of this genus. 



134. Laoren'CIa sp. . . . Eottnest (197). Near L. distkhophjlla, 3. Ag.? It requires further 



examination. Besides these species of Laurencia here enumerated, I have collected two or 

 three others in small quantity, which for the present I suppress. 



1 35. Lomentakia zostericola, n. sp. ; fronde pusilla (1-2 unciali) paniculatim ramosa ambitu ovata ; 



caule basi inconspicue articulato supra toruloso; ramis ramulisque patentibus suboppositis 

 V. verticillatis (nunc sparsis) obtusis articulato-constrictis, articulis diametro brevioribus 

 v. subajqualibus ; ceramidiis globosis sparsis v. aggregatis. On Zostera at Eottnest (195). 

 The spores are affixed to a very large placenta, nearly filling the cavity of the ceramidium, 



136. Cn kTiKiK parvula. Lomentaria parvula, Ag. King George's Sound and Eottnest (57^. 



137. Champia ajjinis. Lomentaria affinis, Ag. King George's Sound, Eottnest, and Garden Island 



(194). 



138. Champia compressa, Harv. Eottnest, rare (245). 



Order IIL— WEANGELIACEvE. 



139. WRAyiGELiA penicillata, Ag. ! IF. ^jfamosa, Harv. 1 Alg. Tasm. On Zostera leaves at Eott- 



nest, abundant (198). Much more robust than a Mediterranean specimen with which I 

 have compared it, but very similar to one from Florida. My W. plumosa from Tasmania 

 seems to differ solely in being more luxuriant, so far as lean judge from a very poor speci- 

 men now before me. 



140. Wrangelia ? jd^arrfAjana, n. sp. ; fronde cartilaginea (6-8 unciali) corticata decomposite 



ramosissima ; ramis ramulisque dichotomo-alternis pluries divisis patentissimis ad genicula 

 verticillatimramellosis; ramellis minutissimis dichotomo-multifidis obtusis ; articulis ramel- 



