Photo-Kinesis in the Ammocoete Larva of the Brook Lamprey

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Abstract
1. Ammocoetes show no inherent rhythm of locomotory activity to parallel that demonstrated for their melanophores. 2. They react ortho-kinetically to light above a threshold lying between 5.4 and 54m.c. 3. Ammocoetes collect in the dark end of a light gradient at intensities below the threshold for ortho-kinesis. A klino-kinesis would appear to be the mechanism by which this aggregation is accomplished. 4. All the evidence points to the conclusion that the locomotory reactions of the ammocoete to light bears no directional relationship to the source of stimulation and that they are entirely at random.

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