A collection of Pisidium from the island of Java, Indonesia

Recently I received from Mr L. J. M. BUTOT (R.I.V.O.N., State Institute for Nature Conservation, Zeist, Netherlands), at the time curator of the Zoological Museum at Bogor, Indonesia (formerly: Buitenzorg, Netherlands East Indies), a collection of pisidia from the western part of the island of Java. An account of the localities and an analysis of these samples, which have all been taken in the neighbourhood of Bogor, are given here. The greater part of the specimens concerned are in the private collection of Mr BUTOT (abbreviated: LB), some other lots in the Zoological Museum, Amsterdam (abbreviated: ZMA/K). I am indebted to Mr BUTOT for the kind loan of this interesting collection and for his permission to publish the results of my study.