1. Darwin, C., "A Monograph on the Sub-Class Cirripedia" Volume 2. Balanidæ, 345. (London: Bay Society, 1854).
2. Gruvel, A., Bull. Soc. Zool. Fr., 32 (1907).
3. Moore, Lucy B., Trans. Proc. Roy. Soc., N.Z., 73, 315 (1944).
4. Orton, J. H., J. Mar. Biol. Assoc., 12, 339 (1920).