Tertiary Foranrinif era from Borneo. 251 



Nummulites javanus and Orbitoides (Discocyclina) stellata ; 

 and (2) a Miocene or Pliocene, characterized by Orbitoides 

 (Lepidocyclina) Verbeeki and 0. (L.) sumatrensis. 



Again, the Gomanton-Hill limestone would appear to 

 represent a Miocene or Pliocene age, on account of its struc- 

 ture exhibiting forms of Orbitoides {Lepidocyclina) suma- 

 trensis ; and, lastly, the u Molengraaff " boulders from West- 

 central Borneo, in which we have identitied Nummulites 

 Djokdjokartce and Orbitoides (Discocyclina), may be regarded 

 as belonging to the Oligocene formation. 



Tertiary Foraminifera are widely distributed over the 

 islands of the Indo-Pacific area; and although our knowledge 

 is more complete concerning those forms found in Sumatra, 

 Java, and Borneo, we are not without evidence of their 

 occurrence in Timor *, Celebes *, the Philippines f, and east- 

 wards to New Guinea J. Moreover at Christmas Island, some 

 200 miles south of Java, Mr. C. W. Andrews § has recently 

 discovered limestones containing Orbitoides and other Forami- 

 nifera underlying a comparatively recent coral-formation. 

 These limestones, when properly investigated, will add anew 

 interest to the geology of this region. 



Before concluding this introductory portion of our work, 

 some acknowledgments are due to those friends who have 

 assisted us in the preparation of this paper. To Mr. H. W. 

 Burrows we are greatly indebted for the careful micro- 

 photographs he has produced of our slides, the negatives of 

 which he has generously allowed us to use for our illustrations 

 on the present occasion ; we have also to thank Mr. Burrows 

 for his otherwise kindly help and interest shown us during 

 our examination of the Bornean rocks. We wish to tender 

 our thanks to Dr. Harmer for the loan of that portion of 

 Brady's type material from Sumatra which is preserved in the 

 University Museum of Zoology at Cambridge, the remainder 

 being in the British Museum at South Kensington. Our 



* K. Martin, " Palaeontologische Ergebnisse von Tiefbohrungen auf 

 Java, nebst allgerneiueren Studien tiber das Tertiar von Java, Timor, 

 nnd einiger anderer Iuseln," Samml. geol. Reichs-Mns. Leiden, 1887, 

 vol. iii. no. 15, p. 310 (Timor), p. 362 (Celebes). 



t F. von Richthofen, " Ueber das Vorkommen von Nummulitenforma- 

 tion auf Japan und den Pbilippinen," Zeitscbr. deutsch. geol. Ges. 1802, 

 vol. xiv. p. 357. 



+ K. Martin, "Eine Tertiarformation von Neu-Gninea und benacli- 

 barten Iuseln," Samml. 'geol. Reicbs-Mus. Leiden, 1881, vol. i. no. 2, 

 p. 72. 



§ Information contained in an Address read before tbe Royal Geogra- 

 phical Society, November 28th, 1898, and published in ' The Geographical 

 Journal' for January 1899; see also Geol. Mag. 1899, January, no. 415, 

 p. 25. 



