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Experiments have shown that salivary gland extracts from marine snail Neptunea antiqua contain an agent with muscarine-like actions; in paper chromatograms the active substance behaved like neurine. In the present investigation a comparison was made between gland extracts and neurine on different biological test objects. Experiments show that the extract of the salivary glands of Neptunea antiqua possesses both muscarinic and nicotinic actions. Experiments suggests that the active agent of the extracts is identical with neurine or a closely related compound. If so the gland should contain as much as about 25 mg of neurine per gram of tissue.