1. Hammond, J., "Reproduction in the Rabbit" (Oliver and Boyd, London, 1925).
2. Hammond, J., and Walton, A., J. Exp. Biol., 9, 307 (1934).
3. Blandau, R. J., and Money, W. L., Anat. Rec., 90, 255 (1944).
4. Pincus, G., and Enzmann, E. V., J. Exp. Zool., 73, 195 (1936).
5. Pincus, G., "The Eggs of Mammals", 87 (The Macmillan Co., N.Y., 1936).