the Colony of Western Australia. 565 



330. CoDiuM laminarioides, n. sp. ; stipite brevi cuneato mox in frondem amplissimam (2-3 peda- 



lem) planam subsimplicem v. parce lobatam expanse. At Rottnest and King George's 

 Sound, on the under surface of table- shaped rocks. If this be only a form of C. elongatum 

 it is indeed an extraordinary one. The undivided frond is often three feet wide by two feet 

 long, resembling a piece of green cloth (227). 



331. CoDlUM spongiosum, n. sp. ; fronde sessili molli polymorpha varie lobata et spongioidea; filis 



interioribus laxiusculis in gclatina immersis, periphericis cylindraceis v. pyriformibu.s 

 obtusis; spermatiis fusiformibus basi et apice acutis. On shells and stones, &c., about low- 

 water mark, common ( ). I do not wonder that this has not been brought to Europe, 

 as it is almost impossible to prevent the spongy mass decomposing (with a very unsavoury 

 smell) during the process of drying. 



332. CoDiDM mamjYteMm, n. sp. ; fronde globosa velreniformi punctoaffixa solida; filis interioribus 



densissime intertextis arachnoideis gelatina subsolida obvallatis, periphericis ma.ximis in- 

 flato-cylindraceis, eorum apicibus ad superficiem frondis quasi mamillis directis, siccitate 

 sericeo-nitentibus. Fremantle and King George's Sound, cast ashore (162). It forms a 

 very solid, green, mammillated ball, composed internally of very slender, densely packed 

 threads, throwing off to all sides externally, radiating branches, whose apices, closely set 

 together, give the mammillated appearance to the surface. 



333. Brtopsis australis. Send.? Very common on rocks, at Rottnest and Carnac (161). 



334. Brtopsis sp. On Zostera, Rottnest (175). 



335. Bkyopsis sp. Perhaps J3. foliosa, Sond. On sand-covered rocks, Rottnest (249). 



336. DiCTYOSPHiERiA sencea, n. sp. ; fronde umbilicata medifixa varie lacera (nunquam vesicata) 



sericea; vesiculis minimis globoso-polyhedris. On rocks near low-water mark, King 

 George's Sound, Cape Riche, and Rottnest (160). Very distinct from D.favulosa at all 

 ages. 



Order II.— CONFERVA CE^E. 



337- Cladophora valonioides, Sond. Common on rocks and in shallow water (55). 



338. Cladophora sp. Sand-covered rocks. King George's Sound (46). 



339- Cladophora sp. C. anastomosans, MS. Cast ashore at Fremantle (163). 



340. Cladophora sp. Fremantle (176). 



341. Cladophora sp. Fremantle (177). 



342. Cladophora sp. Neur C. pellucida. Rottnest, on reefs (275). 



343. Cladophora sp. Allied to C. glaucescens (333). I have neither books nor specimens at hand 



sufficient to determine whether these species have been previously described. 



Order III.—ULVACE^. 



344. PuYCOSERis Ulva, Sond. Garden Island. 



345. Phtcosekis latissima. Ulva lalissima, Auct. I cannot say to which of Kiitzing's species 



