1. Atkins, D.: The ciliary feeding mechanisms of the entoproct Polyzoa and a comparison with that of the ectoproct Polyzoa. Q. Jl microsc. Sci. 75, 393?423 (1932)
2. Barnes, R. S. K. and R. N. Hughes: An introduction to marine ecology, 339 pp. Oxford: Blackwell 1982
3. Best, M. A.: Some aspects of the ecology and physiology of feeding in marine Bryozoa, XXIII+471 pp. Unpublished thesis, University of Liverpool, Port Erin, Isle of Man 1985
4. Best, M. A. and J. P. Thorpe: Effects of particle concentration on clearance rate and feeding current velocity in the marine bryozoan Flustrellidra hispida. Mar. Biol. 77, 85?92 (1983)
5. Branch, G. M.: Competition between marine organisms: ecological and evolutionary implications. Oceanogr. mar. Biol. a. Rev. 22, 429?593 (1984)