DR. C. A. MAC MUNN 0N THE CHROMATOLOGY OP ACTINIA. 
G61 
changed into hsemochromogen and heematoporphyrin, and that it is present in other 
Actiniae. It is named actiniohcematin. 
(2.) It is not actiniochrome, which is a colonring matter found widely distributed in 
Actiniae, which is not changeable into other pigments capable of oxidation and reduction, 
and is mostly confined to the tentacles. 
(3.) A special colouring matter not identical with either is found in Sagartia 
parasitica, which is capable of existing in the oxidised and reduced state. 
(4.) In the mesoderm of Actinia mesembryanthemum, in other parts of the same 
Actinia, and in other Actiniae a green pigment occurs which gives all the reactions of 
biliverclin. 
(5.) Anthea cereus (as already known), Bunocles ballii, and Sagartia bellis yield to 
solvents a colouring matter resembling chloroihcin, and all the colouring matter which 
shows this spectrum is derived from the “ yellow cells ” which are abundantly present 
in their tentacles and elsewhere. By its behaviour with reagents this pigment can 
be shown to be quite different from enterochlorophyll, plant chlorophyll, and the 
chlorophyll of Spongilla, or other animal chlorophyll. 
(6.) When “yellow cells” are present there is probably a suppression of those 
colouring matters, which in other Actiniae appear to be of respiratory use. 
(7.) Other colouring matters which give bands in the blue and violet, and spectro¬ 
scopically resemble lutein, are found especially in the tentacles, but they are not 
generally soluble in those solvents which dissolve the luteins. 
(8.) Pigments whose nature is yet uncertain are also met with, which have been 
described in this paper. 
Explanation of the Spectrum Charts. 
CHART I. Plate G9. 
Sp. 1. Spectrum of the ectoderm of a brownish-red Actinia mesembryanthemum, 
Sp. 2. Spectrum of a red Actinia mesembryanthemum (ectoderm). 
Sp. 3. Spectrum of a reddish-brown Actinia mesembryanthemum (ectoderm). 
Sp. 4. Spectrum of a red Actinia mesembryanthemum (ectoderm). 
Sp. 5. Spectrum of a brown Actinia mesembryanthemum (ectoderm). 
Sp. 6. Spectrum of a brown Actinia mesembryanthemum (ectoderm). 
Sp. 7. Spectrum of a brownish-red Actinia mesembryanthemum (ectoderm). 
Sp. 8. Spectrum of a reddish-brown Actinia mesembryanthemum (ectoderm). 
Sp. 9. Blue “ eve-spot ” of Actinia mesembryanthemum. 
Sp. 10. Spectrum like that of alkaline hsematin, from a rectified spirit and caustic 
potash extract of the ectoderm of Actinia mesembryanthemum. 
MDCCCLXXXV. 4 Q 
