J. S.  Ryland, ?Class Scyphozoa: Order Stauromedusae?, in The Marine Fauna of the British Isles and North-West Europe: Volume I: Introduction and Protozoans to Arthropods, vol. 1, P. J.  Hayward and Ryland, J. S., Eds. Oxford: Clarendon Press (Oxford University Press), 1990, pp. pages 102-107.