tlie Colony of Western Australia. 541 



91. PoLYSipnoNiA ncyfecta, MS. Sand-covered rocks, at Middleton Bay, King George's Sound, 



mixed with P. pennaia and Callith. ci/mosum. I have not fully determined this species, 

 which requires a careful comparison with some others of similar habit (11). 



92. PoLYsiPiiONiA yoccipata, n. sp.; pallida, siccitate purpureo-nigrescens ; frondibus subsolitariis 



(2-3 uncialibus) crassis cartilagineis pellucide articulatis repetite dichotomis v. abortu scor- 

 pioideo-secundis; ramulis ultimis bis terve furcatis apice forcipatis! articulis 6-siphoniis 

 diametro brevioribus ; ceramidiis ovatis sessilibus. On Zostera at Eottnest and King George's 

 Sound (186). A distinct species, looking like a Ceramium to the naked eye. 



93. PoLTSiPHONiA cancellata, Harv. Ner. Austr., t. 15. King George's Sound, common (35). 



94. PoLYsiPHONiA nigrita, Sond. Garden Island and Eottnest (122). 



95. PoLTSiPHONiA aurata, n. sp. ; fusco- rubra, madefacta aurea; frondibus cEspitosis (2-3 uncia- 



libus) capillaribus cartilagineo-membranaceis articulatis decomposite ramosis; ramis dicho- 

 tomis alternisve erecto-patentibus; ramulis alternis v. secundis apice furcellatis; articulis 

 10-siphoniis inferioribus diametro 2-3-plo-longioribus, superioribus sequalibus ; septis angus- 

 tissimis; ceramidiis ovatis sessilibus; tetrasporis magnis subsolitariis. King George's Sound, 

 rare (307). Allied to P.fuTcellata in ramification, and to P. versicolor in substance and colour. 



96. POLTSIPHONIA versicolor, Harv. Ner. Austr., t. 16. King George's Sound (3G), var. /3. tenuior. 



With the preceding (37). 

 97- PoLYsiPHoxiA rostrata, Sond. On Caiilinia, &c. Eottnest and Fremantle (115). 



98. PoLYsiPiioNiA ^ranota, Ag. Sand-covered rocks, Middleton Bay, King George's Sound (12). 



99. PoLisipaotiu. pectinella, n. sp^ siccitate roseo-purpurea; frondibus pusillis (uncialibus) basi 



radicantibus ramosis arachnoideis ; ramis paucis alternis v. sparsis filiformibus simplicibus 

 per totam longitudinem pectinatis ; ramulis secundis patentissimis simplicibus brevibus ob- 

 tusis; articulis 8-siphoniis diametro a;qualibus v. duplo-longioribus. On mud, near high- 

 water mark, Princess Eoyal Harbour, King George's Sound. A larger variety at Eottnest 

 (38). Certainly allied to P. Pecten Veneris, but a far more delicate and more brightly coloured 

 species. 



100. PoLYSiPHONiA obscura, Ag. Sand-covered rocks at Middleton Bay, King George's Sound; 



mixed with P. pennata and P. neglecta (47). 



101. PoLYSiPHONiA Calothrix, n. sp. ; minuta, dense csespitosa, rupestris, badia; surculo prostrato 



radicibus numerosissimis elongatis apice mamilloso-fquamosis radicante; ramis erectis se- 

 cundis simplicissimis brevissimis approximatis subacutis; articulis 10-12-siphoniis, sur- 

 culi diametro duplo-brevioribus, ramorum adultorum sesquiduplo-longioribus ; tetrasporis 

 paucis in ramis nidulantibus. ' On rocks at half-tide level, King George's Sound (337). 

 This spreads in wide patches, like those of Calothrix scojmlorum, which it so closely resem- 

 bles in aspect, that I had actually dried and set it aside for that plant, nor did I discover 

 my error till after I had applied the microscope. It is a larger plant than P. jii'orepens, 

 and very much smaller than P. obscura, to which it is allied. 



102. PoLYSipnoNiA j'rorepens, Harv. Ner. Austr. Parasitical on Dicranema Grevillii, at King 



George's Sound (306). 



103. PoLYSiPHONiA cladostep/tus, Mont. Garden Island and King George's Sound (271). 



4 A 2 



