1. Carnot, P., and Deflandre, C., C.R. Soc. Biol. Paris, 48, 178, 430 (1896).
2. Loeb, L., Arch. EntwMech. Org., 6, 1 (1897).
3. Loeb, L., "The Biological Basis of Individuality", pp. 14, 141 (Springfield, 1945). Kelley, R. W., and Loeb, L., Anat. Rec., 74, 487 (1939).
4. The view adopted by Saxton, J. A., Schmeckebier, M. M., and Kelley, R. W., Biol. Bull, 71, 453 (1936); Fessler, A., Brit. J. Dermatol., 53, 201 (1941); but rejected by Lewin, M. L., and Peck, S. M., J. Invest. Dermatol., 4, 483 (1941).
5. Our operation was based on the description of claw anatomy by le Gros Clark, W. E., Proc. Zool. Soc., 1, 1 (1936).