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Thus, then, the coloring matter described as chlorophyl by Lankester has really been mainly derived from that of the endodermal algae of the variety plumosa, which predominates at Naples; while the anthea-green of Krukenberg must mainly consist of the green pigment of the ectoderm, since the Trieste variety evidently does not contain algae in any great quantity.
Krukenberg, too, who follows these investigators in terming it bonellein, has recently figured the spectra of Anthea-green, and this also seems to differ considerably from chlorophyl, while I am strongly of the opinion that the pigment of the green crustaceans is, if possible, even more distinct, having not improbably a merely protective resemblance.
But since the Naples variety contains a certain amount of ordinary green pigment, and since the Trieste variety is tolerably sure to contain some algae, both spectroscopists have been operating on a mixture of two wholly distinct pigments diatom-yellow and anthea-green. But what is the physiological relationship of the plants and animal thus so curiously and intimately associated?
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