THE CERIANTHAR1AN NERVOUS SYSTEM

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Abstract
Evidence supporting the presence of nerve cells in the column and tentacles of Pacliycerianthiis is described. G. F. Gwilliam has shown that electrical stimuli can be transmitted to the ectodermal muscle by the intact epithelium and subepithelial network of the ectoderm of the column. In these preparations the ectodermal muscle, mesogloea, and endoderm were cut. In contrast, preparations in which the ectodermal muscle has been left intact and the epithelium and subepithelial network cut do not show such transmission. The author and Gwilliam have independently used different silver stain methods to demonstrate large cells, piobably nerve cells, with cell bodies in the base of the epithelium and with fibers running into the subepithelial network. The author has found similar bipolar cells in the tentacles and column by using maceration techniques. These cells are compared with other cell types found in the tentacles.

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