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Show 1 8 9 9 0 CORALLIID.E OF MADEIRA. 63 Key to the four known species of Pleurocorallium. I. Axis partly red, partly white, cortex scarlet. secundum (Dana). " Sandwich Isl " ? II. A * . M r „U t e , cctea yello. o, J e l 3 : ; f E i < , l e y ' " Japan " ? (1) Polype-cells yellow or cream-colour. (a) Polype-cells subhemispherical; only 3 forms of spicula, m D 1 ,, ,. , . , johnsoni (Gray). Madeira (b) Polype-cells cylindrical; more than 3 forms of spicula. /0\ TJ^I n .,. maderense J. Y. J. Madeira (2) Polype-cells vermilion tricolor J. Y. J. Madeira REFERENCES. Pleurocorallium tricolor. 1867. GRAY, J E. (Hemicorallium johnsoni). " Additional Note on Corallium johnsoni." P. Z. S. 1867, p. 126, with a woodcut. £ 1882. I W r , £ £ , O ^ O n a e A™„gem e n t of the Coral- Pleurocorallium johnsoni. 1860. G R A Y J. E.(Corallium). "Notices of some new Corals from Madeira" P Z. S. 1860, p. 394, Radiata, pi. xviii. i « « T rfn n g> Nat' HlSt' Ser' 6' v o L iif' P- 3]1- 1867. GRAY^ J. E. (Hemicorallium). " Additional Note on Corallium johnsoni." P. Z. S. 1867, p. 126. 1870. GRAY, J. E. (Hemicorallium). Catalogue of Lithophytes or Stony Corals in the British Museum, p 24 1882. RIDLEY, STUART O. (Pleurocorallium). " On the Arrangement of the Coralliidae, with Descriptions of new or rare Species." P. Z. S. 1882, p. 221, pi. ix. EXPLANATION OF THE PLATES. PLATE V. Pleurocorallium maaWase, p. 60, about 8 Dat size-The object project™ ,t PLATE VI. Pleurocorallium johnsoni, p. 61, about ?- nat. size. From a photograph. PLATE VII. Fig. 1. Pleurocorallium maderense, p. 60, terminal branchlets with polype-cells. 2. Pleurocorallium johnsoni, p. 61, a terminal branch with polvpe-cells v o 3. Pleurocorallium tricolor, p. 58: a, b, c, spicula of the cortex- dd'd" spicula from the polype-cells, x 400. <*,»,», 4. Pleurocorallium maderense, p. 60: «, J, C) spicula of the cortex • d d' d" e, spicala from the polype-cells, x 400 ' ' ' 5. Pleurocorallium johnsoni, p. 61, spicula of cortex and polype-cells- „ spicule no. 3; bb, spicule no. 1 ; c, spicule no. 2, described on p 62. |