53G Dr. "W. H. Harvey's Account of the Marine Botany of 



25. DiCTYOTA Kunt/iii, Ag. Key West and Eottnest (81 and 225). 



26. DiCTYOTA fastif)iata, Sond. Abundant at Cape Eiche and Fremantle (167). A true Dicti/ota. 



27. DiCTTOTA radicans, n. sp. ; frondeestuposa stipitatabasifibris crassis sparsis e stipite et lamina 



emissis radicante diohotomo-pinuatifida, segmentis cuneatis, lateralibus erectis, sinubus 

 angustis, apicibus obtusissimis; soris effusis in medio parte frondis coUectis. Eottnest and 

 Garden Island (184). This species is readily marked by its rooting by a few rope-like fila- 

 ments. 



28. Djctmota pa/uculata, J. Ag. Common (14). If I rightly understand this plant it varies much 



in breadth and degree of ramification. 



29. DiCTYOTA furcellafa, Ag.? D. minor, Sond. Excessively common in Princess Eoyal Harbour, 



King George's Sound, and elsewhere. In summer it comes ashore in vast banks, and is often 

 the only plant raised from the bottom, by the dredge or hooks, in shallow water (24). 



30. DiCTTOTA dichotoma. King George's Sound and Eottnest (15). 



31. DiCTTOTA ciliata, J. Ag.? Carnac and Eottnest Islands, on shallow reefs, growing with D. 



dichotoma, from which its greener colour and ciliate margins best distinguish it (154). 



32. Stilophoka Lyngbymi, J. Ag. Princess Eoyal Harbour in summer, very common (25). 



33. Htdeoclatheus eancdlatus, Bory. Cape Eiche, Fremantle, and Eottnest (183). 



34. AsPEROCOccus sinuosus, Ag. King George's Sound and Eottnest, &c. (27). 



35. AsPEKOCOCcns Turneri, Hook. A. bidlosus, Auct. King George's Sound and Fremantle (26). 



36. AsPEKOCOCcns echinatus, Lx. King George's Sound ( ). 



Ordeb v.— CHORDAEIACEiE. 



37. Cladosiphon? sp. . . . King George's Sound (17). This has the habit oi Mesogloia virescens, 



and I should so name it, but that the frond is certainly hollow, which character would put 

 it in Cladosiphon. I am by no means, however, satisfied that this is a character of any generic 

 importance in these plants. 



38. MES0GL0iA//«m, n. sp. ; fronde simplici v. ramo uno v. altero donata, basi et apice attenuata. 



King George's Sound (82). 



Order VI ECTOCAEPACE.^. 



39. Sphacelaria paniculata, Suhr. Cape Eiche (297). 



40. Sphacelaria Novce Hollandia:, Sond. Cape Eiche, on rocks and shells in shallow water, com- 



mon. Dredged at Fremantle (2y6). 



41. Spuacelaria cirrhosa, Ag. On Zostera leaves, Fremantle, common (153). 



42. EcTOCARPUS siliculosus, Lyngb. Very abundant at King George's Sound, in winter. Just 



commencing at Eottnest in June; and at Cape Eiche in March (322). 



