Hayward, P.J., Wigham, G.D. & N. Yonow, 1990. Mollusca I: Polyplacophora, Scaphopoda, and Gastropoda. In: The Marine Fauna of the British Isles and North-West Europe. (ed. P.J. Hayward & J.S. Ryland). Clarendon Press, Oxford: 628-730. Hayward, P.J., 1990. Mollusca II: Bivalvia and Cephalopoda. In: The Marine Fauna of the British Isles and North-West Europe. (ed. P.J. Hayward & J.S. Ryland). Clarendon Press, Oxford: 731-793. Nesis, K.N., 1987. Cephalopods of the world. T.F.H. Publications, Inc., Ltd. Poppe, G.T. & Y. Goto, 1993. European Seashells. Vol. II. 221 pp. Wiesbaden/Verlag Christa Hemmen. |