248 Messrs. R. B. Newton and R. Holland on some 



British Museum a series of limestone specimens which he 

 collected in various parts of Borneo during a long residence 

 in that island, with a request that the organisms contained in 

 them might be examined, so that a satisfactory conclusion 

 might be arrived at respecting their probable geological age. 

 It was found on examination that these specimens were 

 divisible into two distinct groups — one Mesozoic, the other 

 Tertiary. The former series, already referred to by one of 

 us* in a published communication, included limestones 

 obtained from localities in the western end of the Sarawak 

 province on or near the river of the same name, which were 

 largely composed of coral, bryozoan and sponge structures, 

 and regarded as belonging to the Middle Oolite division of 

 the Jurassic system. 



The Tertiary limestones, containing the Foraminifera now 

 about to be described, were collected in two widely distant 

 regions of Borneo, some being found in the Malinam River 

 (a tributary of the River Baram), which flows between the 

 limestone-mountains of Molu and Barib, near the boundary of 

 the Brunei and Sarawak divisions of the country ; whilst the 

 remainder were obtained from Gomanton Hill, in the Kina- 

 batangan district, north-east of the island, a locality much 

 celebrated for some rich guano- deposits which are worked 

 there. 



From their occurrence in a river-bed the Malinam-River 

 limestones are naturally rounded and waterworn ; when cut 

 and polished, or if their external surfaces are merely wetted, 

 they are found to contain numerous Foraminifera, as well as 

 calcareous alga? (Lithothamaium) &c. 



In these limestones we have determined the following 

 specimens : — 



Nummulites javanus, Verbeek. Form3 A and B; 

 Orbitoides (Lepidocyclrna) Verbeeki, sp. n. ; 



( ) sumatrensis, Brady; 



(Discocyclina) steltala, Arehiac ; 



and other Discocyclines, Cycloclypeus, and many Milioline 

 and Rotaline forms. 



distribution and the origin of the limestone-caves. On these subjects he 

 contributed several papers to the scientitic journals. His loss will be 

 greatly felt by all those interested in the natural history of Borneo. 



* R. B. Newton, "On a Jurassic Laineliibrauch and some other asso- 

 ciated Fossils from the Sarawak River Limestones of Borneo ; with a 

 Sketch of the Mesozoic Fauna of that Island," Geol. Mag. 1897, pp. 407- 

 415. 



