561 
the Colony of Western Australia. 
298. Callithamnion verticale., n. sp. ; fills erectis (uncialibus) oapillaribus subsolitariis parum 
ramosis, ramis 1-2-lateralibus brevibus cum filo primario e quoque articulo opposite plu- 
mulatis; plumulis e medio articuli egredientibus distichis verticaliter patentibus (latus 
planum ad latera vertentibus) ambitu ovatis pinnatis; pinnis omnibus plus minus furcatis; 
articulis diametro aaqualibus v. sesquilongioribus ; apicibus acutis; tetrasporis solitariis 
ramulum pusillum pinnarum terminantibus. Parasite on Algm at Garden Island (267). 
Very nearly allied to the preceding; but having a different aspect, from the different direc- 
tion of the flat surface of the plumules. 
299. Callithamnion pulchellum, n. sp. ; pusillum (semi-unciale) ; filo primario ramisque prima- 
riis prostratis repentibus demum ramos secundarios erectos simplices v. parum ramosos 
emittentibus ; ramis omnibus e quoque articulo opposite v. cruciatim plumulatis; plumu- 
lis 2-4 infra apicem articuli egredientibus patentibus ambitu ovatis pinnatis; pinnis 
simplicissimis approximatis obtusis; articulis ramorum diametro 2-4-plo-longioribus, 
pinnarum et pinnellarum diametro brevioribus; favellis simplicibus rachidem plumuli ter- 
minantibus; tetrasporis a pinnellis abbreviatis formatis. Parasitic on various Algae; espe- 
cially on Areschougia australis. Eottnest and Cape Eiche (230). At first I supposed this 
beautiful little plant to be C. australe, J. Ag., but on comparison with his description, my 
plant must be different. The plumules on theyounger part of the frond are always opposite and 
vertical ; those on the older erect branches are frequently in fours, cruciate and horizontal. 
Can this be C. Preissii, Sond. ? The specimens with cruciate plumules would be near Sen- 
der’s description. 
300. Callithamnion simile. Hook, and Harv. On Fucoidem at King George’s Sound and Eottnest 
(90). I have compared the specimens with one from Kerguelin’s Land, and find them to 
agree. 
30 i . Callithamnion Wollastonianum, n. sp. ; fronde ultra-setacea elata (4 unciali) basi tenuiter corti- 
cata sursum longe pilis squarrosis stuposo-hirsuta subdistiche ramosissima; ramis alternis 
decomposito-pinnatis, penultimis distichis pellucide articulatis alterne plumulatis; plu- 
mulis patentibus longissimis ambitu linearibus; pinnis tenuibus erectiusculis brevibus, 
inferioribus simplicibus, superioribus saipius furcatis v. pinnulatis; tetrasporis solitariis ad 
ramulos brevissime pedicellatis ; articulis diametro 2-4-plo-longioribus. Middleton Bay, 
King George’s Sound, rare in August (329). A very beautiful species, which I name in 
affectionate regard to the family of Archdeacon Wollaston, from whom I received unva- 
rying kindness during the whole of my stay at King George’s Sound. It is nearly allied to 
C. latissimum, but differs in several respects. 
302. Callithamnion Brownianum, n. sp. ; tronde ultra-setacea elata (4 unciali) subecorticata 
sursum longe pilis squarrosis stuposo-hirsuta quoquoversum ramosissima; ramis pluries 
alterne decompositis, penultimis quoquoversis pellucide articulatis nodosis (parietibus cel- 
lularum crassis gelatinosis), alterne plumulatis; plumulis quoquoversis brevibus cri.spis 
pinnatis, pinnis oapillaribus longissimis maxime curvatis inflexis; articulis pinnularum 
diametro 4-plo-longioribus; tetrasporis brevissime pedicellatis solitariis v. geminis ad 
latera pinnularum enatis. On Zostera at Eottnest, Fremantle, and King George’s Sound 
