4Forney, G. G.,Boucot, A. J,and Rohr, D. M et al.Siluriaan and Lower Devonian Zoogeogarphy of selected Molluscan Genera. Communities of the past。 . 1981
5Kase, T,,and Nishida, T.A Middle Devonain gastropod faunale from the Nakazato Formation of Katakami, northeast Japan. Bull. Natn. Sci. Mus. Tokyo, Ser C . 1986
6Kayser,H. E.Ueber einige neue oder wenig gekannte Verstein-erungen des rheinischen. Devon. Deutsch. geol. Gesell. Zeitsehro . 1889
7Linsley R. M.Gastropods of the Middle Devonian Anderdon Limestone。. Bull. Am. Plaeont . 1968
8Linsley,R. M.Gastropods of the Devonian. The Devonian System, Special Papers in Palaeontology 23 . 1979
9Roh, D. M,and Smith. R. E.Lower Devonian gastropoda from the Canadian Arctic Islands. Canadian Journal of Earth Sciences . 1979
10Talent,J. A. et al.Cour. Forsch. Inst. Senkenbery. Cour. Forsch. Inst. Senkenbery . 1987
