This is a truly interactive multimedia CD-ROM on the 337 species of sponges recorded in the coastal areas of the north-east Atlantic down to southern Portugal, found to a depth of 200 m. Each species is described and illustrated - the CD-ROM contains 1510 photographs and drawings - and can be accessed by two different identification keys. An illustrated glossary, a 'literature module' and the 'distribution module' are fully linked with the individual species, making searches easy. The 'higher taxa module' leads to information on the families, orders and classes of the sponges. As a bonus the CD-ROM features a 'who is who module' which contains portraits and biographic data on sponge systematicians.