RMRDKH54–. The Cambridge natural history. Zoology. STRUCTURE OF HALICHONDRIA 169 The colour of the species is as inconstant as its form, ranging from green to light brown and orange. MacMunn concludes from spectroscopic work that H. panicea contains at lease three pigments, a chlorophyll, a lipochrome, and a histohaematin.^ Lipochromes vary from red to yellow, chlorophyll is always associated with one or more of them. Histohaematin is a respiratory pigment. Proof has not yet been adduced that the chlorophyll is proper to the sponge and is not contained in symbiotic algae. In spite of all this inconstan
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