Busk, G. 1884. Report on the Polyzoa collected by H.M.S. Challenger during the years 1873-76. - pp. i-xxiii (= 1-23), (1), 1-216, Pl. I-XXXVI (= 1-36), 1 map, in: Thomson, C. W. & Murray, J.: Report of the scientific results of the voyage of H.M.S. Challe