r. RHODOSPERME. Fam. Corallinacee. 
Puate CCL. 
CHEILOSPORUM SAGITTATUM, “resed. 
Gen. Cuar. Frond plano-compressed, calcareous, articulated, dichotomous ; 
articulations obsagittate or obcordate. Lructification : 1, conceptacles 
ovoid, immersed in the upper margin of the lobes of the articulations, 
one in each lobe, furnished with an apical pore and containing in the 
base of the cavity a tuft of erect, at length four-parted, spore-threads. 
—Cuerttosrorum (Dne.), from yeros, a lip, and o7ropos, a seed, in 
allusion to the marginal fruit. 
Frons plano-compressa, calcarea, articulata, dichotoma ; articulis obsagittatis v. 
obcordatis. Fruct.: 1, conceptacula ovoidea, in margine loborum superiore 
articulorum ulrinque immersa, apice poro pertusa, in fundo loculi fila spori- 
fera fasciculata erecta demum quadripartita foventia. 
CuerLosporum sagitlatum ; frond robust, stipitate, becoming broader up- 
wards; articulations of the branches deeply sagittate, tapering at 
base; lobes patent, broadly subulate, acute. 
Ch. sagittatum ; fronde robusta stipitata sursum subdilatata, articulis ramorum 
profunde sagittatis basi attenuatis, lobis patentibus late subulatis acutis. 
CHEILOSPORUM sagittatum, dresch. in J. Ag. Sp. Alg. v. 2. p. 545. Harv. 
Alg. Austr. Ewxsic. n. 445. 
AMPHTROA sagittata, Due. Ann. Sc. Nat. 1842. Harv. Ner. Austr. p. 102. 
CoRALLINA sagittata, Lama. in Freye. Voy. Zool. p. 625. t. 95, f. 11, 12. 
Has. Swan River, Preiss. Kiama, New South Wales, on tidal rocks, 
We iH: 
Geocr. Distr. Mauritius. Port Natal and Algoa Bay, South Africa. 
Descr. Root a spreading calcareous crust. Fronds densely tufted or spreading 
over wide patches, 2-4 inches high, half a line to nearly a line in breadth, 
stipitate, many times regularly dichotomous above the middle, flabelliform 
in outline and fastigiate. Lower articulations obconical, with short ap- 
pressed lateral lobes ; middle and upper articulations deeply sagittate, com- 
pressed, with a trace of midrib, their lobes broadly subulate, spreading, 
acute or subacute. The terminal articulation of branches and ramuli is 
either obovate or obcordate. En hie (on a South African specimen) 
ovoid, half immersed in the upper edge of the lateral lobes of the joints, 
especially towards the ends of the branches, cont: uning a tuft of four-jointed 
spore-threads. When deprived of lime by acid, the articulations are ele- 
gantly banded by alternate bands of roundish and of linear cells. The 
colour, when growing, is a deep and rather bright purple-red, which becomes 
