Tertiary Forominif era from Borneo. 249 



Tlie Gomanton-Hill rock is a cream-coloured limestone, 

 much less crystalline than that from the Malinam River, and 

 containing a small percentage of phosphate (information 

 kindly given us by Mr. G. T. Prior, of the British Museum). 

 So far as our examination has gone, we have observed no 

 Nummulites in this limestone, its structure yielding Orbitoidea 

 {LepidocycHna) sumatrensis, Brady, Linderina, sp., together 

 with numerous forms of Miliolines and Rotalines. 



(3) Professor Molengraajpa specimens. — Professor Molen- 

 graaff's specimens were obtained during his expedition to 

 Central Borneo in the years 1893 and 1894, of which a 

 geographical notice* and a preliminary geological report f 

 have already been published. 



Tn his account of the fossils, however, Dr. Krause excludes 

 all consideration of the Radiolaria and Nummulites, specially 

 stating that the former were under description by Dr. G. J. 

 1 1 inde and the latter by Professor Schlumberger (see p. 170 

 of Krause's paper). 



When Professor Molengraaff visited the British Museum in 

 the spring of 1897 he requested one of the present writers to 

 undertake an examination of his Bornean Foraminifera, men- 

 tioning at the time that they had been placed before Professor 

 Schlumberger, of Paris, who had been obliged to return them 

 unidentified on account of their very imperfect preservation. 

 The specimens and microscopical preparations were therefore 

 duly forwarded to the British Museum from the Laboratory of 

 Mineralogy at Amsterdam J, an examination of which proved 

 the presence of Nummulites Djolcdjokartce, K. Martin, a species 

 common to the Oligocene rocks of Sumatra and Java, 

 occurring in boulder no. 985 ; Discocyclina, a subgenus of 

 Orbitoides ; and possibly Amphistegina, 



The Molengraaff material is in the form of boulders mostly 

 composed of a coarse quartz conglomerate, although the largest 

 (nos. 984 and 986, in two pieces) is of somewhat different 

 structure, being more of the nature of a grey felspathic grit, 

 with intercalated lustrous black patches of a carbonaceous 

 substance. Throughout this mass furaminiferal remains are 



* G. A. F. Molengraaff", " Die Niederlandische Expedition nach Zentral- 

 Borneo in den Jahren 18l>3 u. 1894," Peterrnann's ' Mittkeilungen,' 1895, 

 vol. xli. p. 201. 



t P. <i. Krause, " Ueber Tertiare, Cretaceische und altere Ablager- 

 ungen aus West-Borneo," Sam ml. geol. Reichs-Mus. Leiden, 1897, vol. v. 

 ser. 1, p. 169. 



\ This was effected through the kindness of Mrs. Molengraaff, her 

 husband having started for Pretoria to take up his new position of State- 

 Geologist to the South African Republic. 



