The positive identification of the various sponges, especially the more critical species, has always proved difficult, relying heavily on microscopic examination of skeletal spicules, size, shape and arrangement. At the present time approximately 304 species have been recorded from around the British coastline, of which about 100 have been recorded from Cornish waters. Gainey, in Spalding, A., (Ed) 1997, has previously reviewed the status of the sponges around the Cornish coastline. There is no Red Data Book for these species and the following sponges have been classified as pRDB or pNS according to the author’s experience, Ackers et al. (1992) and further helpful comments from G. Ackers.