the Colony of Western Australia. 555 



Order XI.— CEYPTONEMIACEiE. 



241. Mychodea carnosa. Hook, and Harv. Cape Eiche and King George's Sound (99). The cys- 



tocarps in this and in the following species are external, hemispherical, sessile on the sides 

 of the ramuli, by which character, and the very large size of the intermedial cells of the 

 frond, this genus differs from Cystoclonium ; to which, however, it is closely allied. 



242. Mychodea memhranacea, H. and H. King George's Sound (42). 



243. Callophyllis coccinea, H. Garden Island (137). My (263) is probably only a very narrow 



variety of this variable plant. 



244. Callophyllis sp King George's Sound (151). Delicately membranous, with 



marginal fruit. 

 24o. Kallymenia cribrosa, n. sp. ; stipite brevi in frondera maximam simplicem v. bipartitam 

 rotundato-reniformem ampliato, lamina basi cordata gelatinoso-membranacea foraminibus 

 ciroularibus crebris pertusa; cystocarpiis sparsis. Fremantle and King George's Sound, 

 rare. June (274). A very remarkable species, elegantly perforated, like an Agarunt. 



246. Gigartina disticJia, Sond. Fremantle (262). A solitary specimen only. 



Gattya, nov. gen. Frons merabranacea, compressa, disticha, pinnatifida, e filo centrali ver- 

 ticillatim ramelloso composita. Filum centrale articulatum, callithamnoideum, ad genicula 

 fila verticUlata dichotoma emittens, ramellorum apicibus in stratum periphericum membra- 

 naceum arete cohajrentibus. Ci/stocarpia et Tetraspone ignots. Alga tenella, parasitica ; 

 structura fere Endocladice ; habitu diversissimo ; atiinitate magis ad Catenellam accedens. 

 The generic name is given in honour of Mrs. Margaret Gatty, of Ecclesfield, Yorkshire, 

 a diligent explorer of British Algs and Marine animals. 



247. Gattya pinnella, n. sp. ; parasite on Sarcocladia, and on Corallines, Eottnest (223). A beau- 



tiful little plant, fit to bear a lady's name, and of a very curious structure. Though the 

 fruit is unknown, I have no hesitation in proposing the genus. 

 Horea, nov. gen. Frons carnoso-membranacea, plano-compressa, e stratis tribus cellularum ■ 

 composita; stratum meditllare e cellulis masimis inanibus demum ssepe ruptis; intermedium 

 cellulis pluriseriatis minoribus coloratis; corticale fills moniliformibus verticalibus dichoto- 

 mis muco cohibitis formatum. jfai'eto intra pericarpium proprium apice spinis coronatum, 

 poro pertusum, ad placentam basalem aflixa:; fills arachnoideis laxe circumdatoe, sporas 

 conglobatas angulares foventes. Telrasporce sparsje, cruciatim divisa;. Algm Australasics, 

 rosese, distiche decomposito-pihnatte v. dichotoma;, chartse arete adha:rentes. The name is 

 given in honour of Rev. W. S. Hore, of St Clement's, Oxford, an excellent algologist, and 

 ardent and successful explorer of the Alga; of Plymouth Sound, &c., to whom I am indebted 

 for large numbers of beautifully preserved specimens of rare British Alga;. 



248. HoREA halymetiioides, n. sp. ; fronde subdichotoma, segmentis decomposito-pinnatis ambitu 



ovatis, pinnis pinnulisque divaricato-patentibus nunc spurie anastomosantibus attenuatis 

 acutis, pinnulis setaceis. Fremantle, common (152). 



249. lioREA Jiabelli/ormis, n. sp. ; fronde flabelliformi subfastigiata dichotoma, laciniis dichotomo- 

 VOL. XXII. 4 C 



