“Inkfishes,” said daddy; “aren’t black at all. In fact, they look very much like the ordinary jellyfish. But they are called inkfishes because when an enemy comes near them they drop ink out of an ink pocket they have near their mouths. You see, they can see perfectly through the ink, but the other fishes can’t and so when they dive down again and again and try to catch the inkfishes, they can’t do it. The water is so black they can’t see anything and they flounder off into the clear water, while the inkfishes keep out of their way.