.5G0 Dr. W. H. Harvey's Account of the Marine Botany of 



King George's Sound and Kottnest (51). A beautiful and very distinctly characterized 

 species of the C Turneri section, which I first gathered at Belligam Bay, Ceylon, in com- 

 pany with my friend G. H. K. Thwaites, Esq., of Peradenia Botanical Gardens. 



292. Callithamnion cjmosKm, n. sp. ; densissime caespitosum; filis primariis repentibus intricatis, 

 secundariis erectis arachnoideis (uncialibus) vage ramosis, ramis subdichotomis t. alternis 

 minoribus flliformibus erectis longe simplicibus obtusis, articulis diametro multoties 

 (8-12-plo) longioribus cylindraceis ; tetrasporis in cyrais veris tequalibus v. scirpoideis 



secus ramos evolutis dispositis; favellis ? On sand-covered rocks, Middleton Bay, 



King George's Sound and Rottnest; often half buried in sand (10). The cymoid inflores- 

 cence is very peculiar, and beautifully accurate to the typical cyme. 



29.3. Callithamnion (/cKcato/am, n. sp. ; pusillum, arachnoideum, filo primario repente; secunda- 

 riis erectis (vis uncialibus) parum ramosis e quoque geniculo plumulatis, plumulis oppo- 

 sitis per paria decussatis infra apicem articuli egredientibus tenuibus laxe pinnatis, pinnulis 

 inferioribus ssepius oppositis reliquis alternis e rachide flexuosa emissis omnibus attenuatis 



simplicibus V. ramulo uno alterove auotis; fructu Parasite on Solieria cuistralis, 



at King George's Sound. A very delicate and beautiful little plant (339). 



294. Callithajinion i/rac&ntuOT, n. sp. ; minutum (1-2 lineas altum); filo primario repente crasso 

 ramos suboppositos liberos emittente ; ramis filo primario quadruplo-angustioribus pinnatis, 

 piunis oppositis patentibus simplicibus v. latere inferior! subramellosis subattenuatis obtu- 

 siusculis; articulis fill primarii diametro sesqui v. subduplo, ramorum 4-5-plo, ramulorum 

 sesquilongioribus. Parasite on Fucoid^, Rottnest, rare (327). Apparently nearly allied to 

 C. leptodadiim. Mont.; but scarcely the same? 



29.3. Callithamnion ara/eaiiim, n. sp. ; filo primario repente; secundariis erectis (sub-uncialibus) 

 capillaribus subdichotomis v. alterne ramosis corymboso-fastigiatis ; ramis omnium serierum 

 quoquoversum egredientibus, minoribus caule duplo-angustioribus, ramulis ad geniculafere 

 omnia verticillatis spinsformibus patentissimis brevissimis simplicibus subaoutis; tetra- 

 sporis solitariis ad ramulos lateralibus; articulis ramorum diametro 2-3-plo-longioribus. 

 On Zostera, at King George's Sound, rare (343). 



296. Callithamnion SjOi'nescens, KiJtz.? CaLtomentellum, Harv. MS. Very common, everywhere 



on Algce, &c. This species is so common that it can hardly have escaped Peeiss, and there- 

 fore I suppose it the C. spinescens of Sender's list. But the ramuli are not whorled ; but 

 opposite and decussated ; one pair spreading one way, the ne.xt at right angles to them. In 

 all my specimens the articulations of the stem are very short. In habit, it has much re- 

 semblance to Jungermannia tomentella (48). 



297. Callithamnios hori.:ontale, n. sp. ; filis erectis (uncialibus) capillaribus solitariis parum 



ramosis, ramis 3-4-lateralibus simplicibus patentibus cum filo primario e quoque articulo 

 opposite plumulatis; plumulis e medio articuli egredientibus subdistichis horizontalitev 

 patentibus (latus planum sursum vertentibus) ambitu ovatis pinnatis; pinna infima simplici, 

 ceteris furcatis; articulis omnibus diametro o?qualibus v. sesquilongioribus; apicibus acu- 

 tis; tetrasporis solitariis ramulum pusillum pinnarum terminantibus. Parasitic on tr)''j/. 

 Binderiana at Rottnest; and on Pol. nigrita at Garden Island (254). 



