Allman 1888. Report on the Hydroida dredged by H.M.S. Challenger during the Years 1873-76. Part II.The Tubularinoe, Corymorphinoe, Campanularinoe, Sertularinoe, and Thalamophora. Scientific Results of the Voyage of H.M.S. Challenger during the years 1873-76, vol. XXIII, part lxx, lxix & 90 pp., 39 pls., & map. 1888: p. 840