Abstract

1. 1. The fine structure of the paired rhabdomeric photoreceptors in the fresh-water nematode, Chromadorina bioculata is described. 2. 2. The structure, solubility and spectral characteristics of the conspicuous red shading pigment are given and compared with pigment of other nematodes and other invertebrates. 3. 3. The functional arrangement of the receptor in movement is described. 4. 4. The probability that photic responses are under cholinergic nervous control is discussed.

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