1. Allman, G. J.: A monograph of the gymnoblastic or tubularian hydroids. — London 1871.
2. Allman, G. J.: Report on the hydroida, dredged by H. M. S. Challenger during the years 1873–76. — Report on the scientific results of the exploring voyage of H. M. S. Challenger 1873–76. — Zoology. Vol. XXIII.
3. Steinmann, G.: Über fossile Hydrozoen aus der Familie der Coryniden. — Palaeontographica,25, 101–124, 1878.