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This one is Janolus fuscus.
As you can see, it is quite small compared to my finger, so they take quite the eye to spot in the tide pool. (Yaquina State Park)
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Maturation sequence.
Illustration by Dorothy Sturm for The Morphology of Human Blood Cells by Lemuel Diggs.
Found here.
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The color saturation of this image was increased to highlight the different hues on the surface of the moon, which display the various minerals it has.





