Schilder F.A. & Schilder M., 1953- — Die Bänderschnecken

1957. Eine Studie zur Evolution der Tiere + Schlu§: Die Bänderschnecken Europas. Jena, Gustav Fischer. Two parts in folio, cloth, original wrappers preserved, pp. 206 with 15 figs. and 80 maps. An important study on the genus Cepaea on its variability and the question of the validity of Darwin's selection theory.