Hydractinia verdi Ritchie 1908

Ritchie 1908. On Collections of the Cape Verde Islands Marine Fauna, made by Cyril Crosland, M.A. B.Sc. F.Z.S., of S. Andrews University, July to September 1904.-The Hydroids. Proceedings of the Zoological Society of London, 1907(ii) 1908: (488-514)