the Colony of Western Australia. 
541 
91 . PoLYSiPHONiA neglecta, MS. Sand-covered rocks, at Middleton Bay, King George’s Sound, 
mixed ■with P. pennata and Callith. eymosum. I have not fully determined this species, 
■which requires a careful comparison ■with some others of similar habit (11). 
92 . PoLYSiPHONiA /orctpato, 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 . PoLYSiPHONiA cancellata., Harv. Ner. Austr., t. 15. King George’s Sound, common (35). 
94 . PoLYSiPHONiA nigrita, Sond. Garden Island and Kottnest (122). 
95. POLYSIPHONIA aurata, n. sp. ; fusco-rubra, madefacta aurea; frondibus ciespitosis (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 eequalibus; septis angus- 
tissimis ; ceramidiis ovatis sessilibus ; tetrasporis magnis subsolitariis. King George’s Sound, 
rare (307). Allied to P. furcellata in ramification, and to P. versicolor in substance and colour. 
96 . POLYSIPHONIA versicolor, Harv. Ner. Austr., t. 16. King George’s Sound (36), var. /3. tenuior. 
With the preceding (37). 
97 . POLYSIPHONIA rostrata, Sond. On Caulinia, &c. Kottnest and Fremantle (115). 
98. PoLYSiPHONiAy)e»raata, Ag. Sand-covered rocks, Middleton Bay, King George’s Sound (12). 
99 . POLYSIPHONIA 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 aequalibus v. duplo-longioribus. On mud, near high- 
water mark. Princess Eoyal Harbour, King George’s Sound. A larger variety at Kottnest 
(38). Certainly allied to P. Pecten Veneris, but a far more delicate and more brightly coloured 
species. 
100. POLYSIPHONIA 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 casspitosa, rupestris, badia; surculo prostrate 
radicibus numerosissimis elongatis apice mamilloso-squamosis radioante; ramis erectis se- 
cundis simplicissimis brevissimis approximatis subacutis; articulis 10-12-siphoniis, sur- 
culi diametrq 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 ■w'ide patches, like those of Calothrix scogoulorum, ■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. prorepens, 
and very much smaller than P. ohscura, to which it is allied. 
102. POLYSIPHONIA prorepens, Harv. Ner. Austr. Parasitical on Dicranema Grevillii, at King 
George’s Sound (306). 
103. PoLYSiPHONiA cladostephus, Mont. Garden Island and King George’s Sound (271). 
4 A 2 
