1. Pantin, C. F. A., J. Mar. Biol. Assoc. U.K., 13, 24 (1923).
2. Mast, S. O., J. Morph. Physiol., 41, 347 (1926).
3. Allen, R. D., Biol. Bull., 109, 339 (1955).
4. Allen, R. D., “Amœboid Movement”, in Vol. 2 of “The Cell”, edit. by Brachet, J., and Mirsky, A. E. (Academic Press, in the press).
5. Allen, R. D., Exp. Cell Research (in the press).