tTie Colony of W istern Australia. 
555 
Oebee XL— CEYPTONEMIACE.E. 
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 membranacea, H. and H. King George’s Sound (42). 
243. Callophyllis cocciued., 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. 
245. Kallymenia cribrosa, n. sp. ; stipite brevi in frondem maximam simplicem v. bipartitam 
rotundato-reniformem ampliato, lamina basi cordata gelatinoso-membranacea foraminibus 
circularibus crebris pertusa; cystocarpiis sparsis. Eremantle and King George’s Sound, 
rare. June (274). A very remarkable species, elegantly perforated, like an Agarum. 
246. Gigartina distichd,^ Sond. Fremantle (262). A solitary specimen only. 
Gattya, nov. gen. From membranacea, compressa, disticha, pinnatifida, e filo central! ver- 
ticillatim ramelloso composita. Filum centrale articulatum, callithamnoideum, ad genicula 
fila. verticillata dichotoma emittens, ramellorum apicibus in stratum periphericum membra- 
naceum arete oohrerentibus. Cystocarpia et Tetrasporce ignotoe. Alga tenella, parasitica ; 
structura fere Eridocladiw ^ habitu diversissimo ; afhnitate magis ad CatcncllaTn, accedens. 
The generic name is given in honour of Mrs. Margaret Gatty, of Ecclesfield, Yorkshire, 
a diligent explorer of British Algaj and Marine animals. 
217. Gatiyx 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. From carnoso-membranacea, plano-compressa, e stratis tribus cellularum 
composita ; stratum medullare e cellulis maximis inanibus demum s£epe ruptis ; intermedium 
cellulis pluriseriatis minoribus coloratis ; corticale filis moniliformibus verticalibus dichoto- 
mis muco cohibitis formatum. iYst-Wte intra pericarpium proprium apice spinis coronatum, 
poro pertusum, ad placentam basalem affixa3; filis araohnoideis laxe circumdataj, sporas 
conglobatas angulares foventes. Tetrasporce sparsse, cruciatim divisse. Algce Australasica;, 
rosea3, distiche decomposito-pinnatse v. dichotomae, chartae arete adhajrentes. The name is 
given in honour of Eev. W. S. Hore, of St Clement’s, Oxford, an excellent algologist, and 
ardent and successful explorer of the Algas of Plymouth Sound, &c., to whom I am indebted 
for large numbers of beautifully preserved specimens of rare British Algaa. 
248. Horea Jialymenioides, n. sp. ; fronde subdichotoma, segmentis decomposito-pinnatis ambitu 
ovatis, pinnis pinnulisque divaricato-patentibus nunc spurie anastomosantibus attenuatis 
acutis, pinnulis setaceis. Eremantle, common (152). 
249. Horea n. sp. ; fronde flabelliformi sub fastigiata dichotoma, laciniis dichotomo- 
VOL. xxir. 4 c 
