It is of importance to know the history of zoological museum collections for it gives information about the trustworthiness of the habitat and the determination of the specimens in the collection. Mrs. Tera van der Feenvan Benthem Jutting, to whom this publication is dedicated, now that she is leaving the museum, has given an excellent account of the mollusc collection, which she had in care for so many years. In this short paper I shall try to give some information about the history of the ichthyological collections and specially of Bleeker’s collection.