In 2000, the National Museum of Wales mounted a marine biological expedition to the Seychelles as part of the Shoals of Capricorn programme. Following this, three new species of Magelona (M. conversa, M. falcifera and M. gemmata) were described, and published in the Proceedings of the 7th International Polychaete Conference. In this second paper, the authors describe a further three new species (M. symmetrica, M. mahensis and M. cepiceps) and present a new record of M. pygmaea Nateewathana and Hylleberg, 1991 – previously known only from Thailand. The taxonomic affinities of the four species are discussed and a key is provided to all seven recorded from the Seychelles.