F. E.  Schulze, Report on the Hexactinellida collected by H.M.S. ?Challenger? during the years 1873-1876. Report on the Scientific Results of the Voyage of H.M.S. ?Challenger?, 1873-1876, vol. Volume 21. Edinburgh: Neill,1880-1895., 1887, p. 514 pp. Illustrated with 104 plates and 11 woodcuts.