562 Dr. W. H. Harvey's Account of th^ Marine Botany of 



(264). Much resembling the last in aspect, but not distichous in any part ; and with re- 

 markably curled pinnules. I name it in compliment to Mes. Richard Brown of Fremantle, 

 an amateur collector of Algse, from whom and her estimable husband I received much 

 kind attention during my stay in their neighbourhood. 

 303. Callithamkion laricinum, n. sp. ; fronde cartilaginea setacea (1-3 unciali) fere ad apices 

 ramorum corticata glabra quoquoversum ramosa ambitu pyramidali; ramis alternis paten- 

 tibus superne sensim brevioribus ramulis dichotomo-multifidis undique obsessis; ramulis 

 pluries dichotomis, segmentis patentibus, ultimis brevissimis spina;formibus ; favellis gemi- 

 nis oblongis ! simplicibus t. furcatis ; tetrasporis globosis ad latera ramulorum sparsis. On 

 Zostera at Rottnest, common (200). This has the aspect and substance of C tetragommi ; 

 but is more nearly related to C. granulatum or C. grande. 

 .304. CALLiTHAMNiON_^a6e/%enim, n. sp. ; fronde erecta crassiuscula alterne decomposito-ramosa 

 omnino ecorticata; ramis ramulisque quoquoversum egredientibus, terminalibus corym- 

 boso-flabellatis, ramulis dichotomo-multifidis fastigiatis; apicibus obtusis patentibus ; favel- 

 lis geminis rotundatis ramulis stipatis (quasi involucratis). On Zostera at Bottnest, and at 

 Garden Island on Alffw (201). Nearly allied to C. cortjmbomm, but a more robust, though 

 smaller plant; with cells more like those of a Griffithsia than of a Callitkamnion. 

 305. Callithamnion midtifidnm, n. sp. ; fronde pusilla (unciali) arachnoidea ecorticata dense cass- 

 pitosa alterne ramosa; ramis simplicibus ramosisve, ramulis alternis quoquoversis dicho- 

 tomo-multifidis; segmentis patentibus obtusis ; articulis ramorum basi incrassatis diametro 

 4-plo, ramulorum cyliudraceis diametro 2-3-plo-longioribus. On sand-covered rocks, half- 

 tide level, generally buried in the sand, the grains of which adhere closely to the filaments. 

 Reefs at Rottnest, May and June (229). 

 :50(i. Callithamnion crispulum, n. sp. ; fronde pusilla (|-f unciali) capillar! ecorticata ca;spitosa 

 inferne quoquoversum, superne distiche ramosa; ramis superioribus e rachide flexuosa 

 alterne plumulatis; plumulis brevissimis alterne pinnatis, pinnis 3-4 simplicissimis filifor- 

 mibus elongatis obtusis eximie arcuato-inflexis ; articulis omnibus diametro sesquilongiori- 



bus; favellis geminis; tetrasporis In shady crevices of rocks, at half- tide level, 



Rottnest. Near C. Borreri, but a much smaller plant, and sufficiently characterized as 

 above (228 a). 



307. CALLnaAUiON pimllum, n. sp.; fronde pusilla (vix unciali) capillari ecorticata casspitosa in- 



ferne simpliciuscula superne quoquoversum ramosa; ramis inferne plumulatis, superne 

 alterne ramosis, ramis minoribus e rachide strictiuscula quoquoversum plumulatis ; plu- 

 mulis brevissimis vix pinnatis; pinnis 2-3 alternis v. secundis elongatis obtusis arcuatis 

 inflexis; articulis omnibus nisi basilaribus diametro 3-plo-longioribus; favellis geminis; 

 tetrasporis globosis ad latera pinnarum solitariis. Crevices of rocks, at half- tide, Rottnest 

 (228 P). At first I had this for a variety of C. crispulum, but it diifers in not being in any 

 part distichous, and in the longer articulations. 



308. Callithamnion 5cn;)i//a, n. sp. ; fronde pusilla (unciali) capillari ecorticata quoquoversum 



ramosa, ramis paucis cum ramulis ambitu clavatis quoquoversum plumulatis ; plumulis in- 

 ferioribus brevibus, superioribus elongatis pinnatis; pinnis simplicibus filiformibus longis- 



