Tertiary Furamiaifera frum Borneo. 251 



Nummulites javanus and Orbitoides {Discocyclina) stellitta\ 

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

 [Lepidocyclina) Verbet'ki and 0. [L.) suinatrensis. 



Again, tlie Gomanton-llill limestone would appear to 

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

 ture exhibiting forms of Orhitoides {Lepiducyclina) suina- 

 trensis', and, lastly, the *' MolengraafF" boulders from West- 

 central Borneo, in which we have identitied Nanimulites 

 DJokdjokarice and Orhitoides {Discocyclina), may be regarded 

 as belonging to the Oligocene formation. 



Tertiary Foraminit'era are widely distributed over the 

 islands of the I ndo- Pacific area : and although our knowledij-e 

 is more com|)lete 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 \. Moreover at Christmas Island, some 

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

 discovered limestones containing Orhitoides and other Forami- 

 nifera nnderlying a comparatively recent coral-formation. 

 These limestones, when properly investigated, will add anew 

 interest to tiie geology of this region. 



Before concluding this introductory portion of our work, 

 some acknowledgments are due to those friends wlio have 

 assisted us in the preparation of this paper. To Mr. II. 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, " Palseontolog-ische Ergebnisse von Tiefbohrungen auf 

 Java, nebst allgemeiueren Studien uber das Tertiar von Java, Timor, 

 und einiger anderer Inselu," Samnil. geol. Reichs-Mus. Ljideii, 18S7, 

 vol. iii. no. 15, p. 310 (Timor), p. 302 (Celebes). 



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

 tion auf Japau und den Pbilippiueu," Zeitschr. deutsch. geol. Ges. ltiG2, 

 vol. xiv. p. 357. 



+ K. Martin, " Eine Tertiiirformation von Neu-Guinea und benacli- 

 barten Inseln/' Samml. 'geol. Reichs-Mus. Leiden, 1681, vol. i. Jio. 2, 

 p. 72. 



§ Information contained in an Address read before the 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. 2-5. 



