1. Bergquist, P. R. and M. E. Sinclair: The morphology and behaviour of larvae of some intertidal sponges. N.Z. Jl mar. Freshwat. Res. 2, 426?437 (1968).
2. ?? and J. J. Hogg: Adaptation to intertidal existence: reproductive cycles and larval behaviour in Demospongiae. Symp. zool. Soc. Lond. 25, 247?271 (1970).
3. Burton, M.: Sponges. ?Discovery? Rep. 6, 237?392 (1932).
4. DeLacey, L.: The ecology and reproduction of two species of intertidal Halichondrida, 120 pp. Unpublished thesis, University of Auckland 1972.
5. Hartman, W. D.: Natural history of the marine sponges of Southern New England. Bull. Peabody Mus. nat. Hist. 12, 1?155 (1958).