Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 398 MOLLUSCA : CEPHALOPODA. FIG. 537. ''Pen' or 'Cuttle-bone' of Loligo pallida, Verrill. FIG. 538. Lnlign pallida, Verrill. Reduced to one-third natural size. colored pigment-cells; and these animals have the power of effecting such changes in these cells, that the hues of the from one moment to another.

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