Collections of fossil vertebrate remains from the Sangiran area in Java have recently been presented to the Rijksmuseum van Natuurlijke Historie by Mr. H. R. van Heekeren and by Mr. J. H. Houbolt. They form a most welcome addition to the Museum collection of fossil vertebrates made by Eugene Dubois in Java in the 189o's; Sangiran is a site known to but not collected at by Dubois. We are grateful to Messrs. Van Heekeren and Houbolt for their generous gift to the Museum; the more important specimens in the Sangiran collection will be the subject of the present note. The Sangiran dome (for the geology of the area see Van Es, 1931: 55-68, and Von Koenigswald, 1940: 26-39), situated approximately 12 km north of Solo (Soerakarta) between the Kali Brangkal and the Kali Tjemoro in Central Java, has been extensively collected at by Dr. G. H. R. von Koenigswald during the 1930's. The cranial and mandibular remains of hominids retrieved from this site between 1936 and 1941 by that indefatigable collector rank among the most important fossil hominid specimensever found in Asia. In the course of his investigations in Java Von Koenigswald established a succession of faunas two of which, the Djetis and the Trinil fauna, are of special interest here as both do occur at Sangiran. The former has been assigned a Lower Pleistocene age, the latter a Middle Pleistocene age by Von Koenigswald; it is even possible that the Sangiran succession extends downward to include an earlier fauna, the Kali Glagah (originally placed in the Upper Pliocene by Von Koenigswald), as a molar fragment of the mastodont described by Van der Maarel (1932) as Tetralophodon bumiajuensis has been recovered, too (Von Koenigswald, 1940: 30). This mastodont, considered characteristic of the