246 Messrs. K. B. Newton and R. Holland on some 



Nummulites ; but it was reserved for P, van Dijk * in 1858 

 to first determine the forms and to identity them as ot 

 " Snessonien " age, the species being as follows : — Nummu- 

 h'na depressa, Orb., N. lenticularis, Bronn, N. mamilla^ 

 HoTiingliaus, and N. ijolygyrata^ Deshayes. 



A further reference to these Nummulites was made by 

 C. de Groot f in a letter to Sir Roderick Murchison during 

 1863, a list of species being given which corresponded 

 exactly with van Dijk's of 1858. 



To Dr. K. D. M. Verbeek \ we are, however, indebted for 

 the eailiest published figures and descriptions of Bornean 

 Foraminifera, issued in 1871. His specimens were obtained, 

 also from the southern part of the island, at Riam Kiwa, 

 Pengaron, &c., and were determined as Nummulites pengaron- 

 ensi's (sp. n.), N. suh-Brongniarti (sp. n.), iV. biantzensis, 

 Archiac, and A^ striata, Orb., var. / (var. nov.), Orhitoides 

 discus, Riitimeyer, 0. Pratti, Michelin, 0. papyracea, Or- 

 bigny, 0. Fortisi, Archiac, &c., all of which were referred to 

 the Eocene period. 



In 1878 Dr. K. von Fritsch § made a further study of a 

 similar series of forms from Southern Borneo, and described 

 them as occurring in the Orbitoidenschichten division of the 

 Eocene beds, under tlie following names : — Nummulites sub- 

 Bro7igniai'ti,\ erheek, Orhitoides jmpyracea, Boub^e, 0. ephip- 

 pium?, Schloth., 0. omphalus, sp. n.?, and 0. decipiens, 

 sp. n.? 



In 1882 Prof. K. Martin || identified Orhitoides dispansa 

 and Nummulina in the Teweh district and near Martapura 

 (S. Borneo) as of probably Eocene age ; but such forms as 

 Cycloclyp)^'^^) Hotalia, Glohigerina, Orhitoides, Textidaria, 

 and Amphistegina, which came from Tungang, on the River 

 Barito, of South Borneo, lie regarded as Miocene. Dr. T. 

 Posewitz ^ next referred to the Foraminifera found near 



* "Over der W'aardc van eenige Nederlansch-Indisclie Kolensoorten," 

 Nat. Tijdsch. Nederl.-Lidie, 185«, vol. xv. pp. 139-158. 



t " Notes on the Mineralogy and Geolog}' of Borneo and the adjacent 

 Islands," Quart. Journ. Geol. Soc. 1863, vol. xix. p. 515. 



X " Die Nunimuliten des Borneo-Kalksteines," Neues Jahrbueli, 1871, 

 pp. 1-14, pis. i.-iii. ; " De Numnuilieten uit den Eoceenen Kalksteen van 

 Jionieo," Jaarb. Mijn. Ned. O.-Indie, 1874, vol. ii. pp. 133-161, plate 

 (=reprint of the 1871 paper). 



§ " Einige Eocane Foraminiferen von Borneo," Pala^ontogi'aphica, 1878, 

 Suppl. vol. iii. pp. 139-1J3, pis. xviii., xix. 



II " Neue Fundpunkte von Tertiiir-Gesteinen im Indischen Archipel ; 

 nach Samnilungen von Horner, Korthals, Macklot, Miiller fund Rein- 

 vv^ardt," Samnil. geol. Keichs-iMiiseiims Leiden, 1882, pp. 132-147. 



^ " Geologische Notizen aus Central-Borneo (Das Tertiare Hiigelland 

 bei Teweh)," Nat. Tijdsch. Nederl.-Indie, 1884, vol. xUii. pp. 169-175. 



