1. Kudo, R. R., “Protozoology” (4th edit., C. C. Thomas, Springfield, Illinois, 1954).
2. Hall, R. P., “Protozoology” (Prentice-Hall, Inc., New York, 1953).
3. Jakus, M. A., Hall, C. E., and Schmitt, F. O., Anat. Rec., 84, 474 (1942).
4. Jakus, M. A., J. Exp. Zool., 100, 457 (1945).
5. Jakus, M. A., and Hall, C. E., Biol. Bull., 91, 141 (1946).