THE NERVE ELEMENTS IN SILVER-STAINED PREPARATIONS OFCORDYLOPHORA

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Abstract
The nervous sYstem in the hydranth of Cordylophora was stained by a modified Peters' silver method. Nerve elements are found only in the ectoderm, where they form a dense plexus, oriented mainly longitudinally. The majority of the nerve cells, whether lying deep in the ectoderm or near the surface, carry a short hair, presumably sensory. These findings are compared to earlier reports on this and other hydroids. There is no clear division into nerve cells and sensory cells, as is claimed in the case of Hydra. The relative abundance of neurons having 1. 2, 3, and 4 fibers is 8, 70, 17, and 5% respectively. The length of most fibers is 100-200 μ.

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