The Marine Mollusca of the Kendeng Beds (East Java) Gastropoda, Part IV (Families Cassididae – Ficidae inclusive)

Part III of this monograph (by Dr. F. A. Schilder) was published in volume 12 of this Journal, pp. 171—194, 1941. The fourth part deals with the families which can be summarised as Tonnacea (= Doliacea Thiele). They contain 31 species, two of which are new to science. The manuscript was already completed in the summer of 1940, but there was no earlier occasion for publication.