Osthimosia zanzibariensis Waters 1913

Waters 1913. The Marine Fauna of British East Africa and Zanzibar, from collections made by Cyril Crossland, M.A., B.Sc., F.Z.S., in the years 1901-1902. Bryozoa-Cheilostomata. Proceedings of the Zoological Society of London, 1913 1913: (458-537)