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The loss of the exposed, sensitive, and worse-than-useless eye, would be a decided gain, while the disused eye-stalk, being no particular detriment to the crab, would be but slightly affected by natural selection, though open to the cumulative effects of disuse. It is but fair to add that these instances of the cave-crab's eye-stalk and the closely-packed teeth are put forward by Mr.
Use-inheritance would be ruinous through causing unequal variation in co-operative parts of which Mr. Spencer may accept his own instances of the jaws and teeth, and the cave-crab's lost eyes and persistent eye-stalks, as typical examples.
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