Abstract

The experiments on the reactions of Gonodactylus glabrous to light and to touching objects show that: 1. It swims towards dark objects even if thereby it has to swim towards the light (skototaxis). 2. Darker objects are preferred to lighter objects. 3. Bigger objects are preferred to smaller objects. 4. In perpendicular light it exhibits a dorsal light compass reaction. 5. It comes to rest when it has many ventral and lateral contact points (low thigmokinesis). 6. It is more active and willing to leave its hiding place in darkness than in light. 7. There is a characteristic compromise in the reaction when light and touch are combined as stimuli acting on the animal in different directions. 8. Light and touch are two stimuli which trap the Gonodactylus under stones and under other objects during the day. When the intensity of light falls to a minimum during the night the animals become less bound to their hiding places and are able to leave their shelter and swim about.

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