1. Adolph, E. F., 1926: The metabolism of water in Amoeba as measured in the contractile vacuole. J. exper. Zool. 44, 355–381.
2. Belda, W. H., 1942 a: Permeability to water in Pelomyxa carolinensis. I. Changes in volume of Pelomyxa carolinensis in solutions of different osmotic concentration. Salesianum 37, 68–81.
3. Belda, W. H., 1942 b: Permeability to water in Pelomyxa carolinensis. II. The contractile vacuoles of Pelomyxa carolinensis. Salesianum 37, 125–134.
4. Belda, W. H., 1943: Permeability to water in Pelomyxa carolinensis. III. The permeability constant for water in Pelomyxa carolinensis. Salesianum 38, 17–24.
5. Carter, L., 1955: Ionic regulation in the ciliate Spirostomum ambiguum. Ph. D. thesis, University of Bristol; publication pending.