Neurosecretion

The occurrence, localization, and quantitative distribution of neurosecretory cells in the central nervous system of Limulus have been described. These anatomical findings are in good agreement with the physiological data of Brown and Cunningham (1941), who demonstrate the presence and distribution of a chromatophorotropic principle in the nervous system of this animal. Therefore, the neurosecretory cells of Limulus may be considered as the source of a substance influencing color change in crustaceans.