1. Chia, F.-S., and Rostron, M. A., J. mar. biol. Ass. U. K., 50, 253 (1970).
2. Elmhirst, R., and Sharpe, J. S., Biochem. J., 14, 48 (1920).
3. Abeloos-Parize, M., and R., C.r. hebd. Séanc. Soc. Biol., 84, 560 (1926).
4. Dalyell, Sir J. G., Rare and remarkable animals of Scotland, represented from living subjects: with practical observations on their nature, 2 (van Voorst, London, 1848).