Abstract
In the course of our systematic study of body righting in the crayfish, Cambarus virilis, Hagen, we observed the following phenomena. Extirpation of both eyes, including the eyestalks, causes the animals to lose permanently their ability to walk forward. A normal crayfish occasionally walks backward, but its usual mode of progression on land is forward. In a large number of crayfish operated upon we never observed any forward movement after the operation. A similar effect may be produced temporarily by merely blindfolding the animal.
Immediately after removal of the eyes the animals cannot turn over when placed on their back, but after a few days some of the operated animals regain their ability to right themselves from the dorsal position.
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