CHROMATOPHORE CONTROL AND NEUROSECRETION IN THE MUD SHRIMP, UPOGEBIA AFFINIS

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Abstract
The eyestalks, sinus glands, and supraesophageal ganglia of the mud shrimp, Upogebia affinis. contain a principle that concentrates the pigment in its red chroma -tophores. A previously undescribed group of cells, with tinctorial properties characteristic of neurosecretory cells, occurs in the eyestalks. Because the arrangement of the cells in this structure is unique among neurosecretory organs, it is proposed that this structure be called the Rosette Body. The secretory product of these cells is probably conveyed through the optic nerve by axoplasmic flow to the supraesophageal ganglia and from there to the sinus glands. The Rosette Body may be homologous with the sensory pore X-organ of higher crustaceans. Three types of cells with tinctorial properties characteristic of neurosecretory cells occur in the supraesophageal ganglia. These observations were discussed in relation to the findings of other investigators.

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