Tertiary Foraminifera from Borneo. 257 



Orbitoidal Limestone of North Borneo (Geol. Mag. dec. iii. 

 vol. v. 1888, pi. xiv. fig. 7) may belong to the Lepidocycline 

 rather than the Discocycline group. 



Dr. Verbeek ventures to put forth an important generaliza- 

 tion based on his study of the Orbitoides of Java and the 

 neighbouring lands. He writes : — " Dans toutes les couches, 

 caracte'rise'es comme eocenes par la presence de nummulites 

 et d'alveolines, il existe de nombreuses discocyclines (y compris 

 des rhipido-, des actino- et des astero-cyclines), mais pas une 

 seule Idpidocycline. Par contre, dans les milliers de plaques 

 microscopiques de roches de Java et de Sumatra, qui d'apres 

 leurs mollusques doivent appartenir au terrain tertiaire supi- 

 rieur, je n'ai rencontre* que des lepidocyclines et jamais je n'y 

 ai observe une seule discocycline." (Op. cit. p. 1164.) 



So far as our observations go they tend to confirm this 

 generalization of Dr. Verbeek. In the sections cut from the 

 pebbles taken from the bed of the River Malinam we find 

 associated with Nummulites a few vertical sections of 

 Orbitoides. We have not been able to discover in our slides 

 any sections showing the chambers of the median plane, but 

 the general appearance of the sections leads us to look upon 

 the Orbitoides as Discocyclines rather than Lepidocyclines. 

 On the other hand, in our sections containing undoubted 

 Lepidocyclines we find no trace of Discocyclines, and Nummu- 

 lites are altogether absent, though we have met with one or 

 two rather obscure sections of Amphistegina. 



4. Orbitoides (Lepidocyclina) Verbeeki, sp. n. 

 (PL IX. tigs. 7-11 ; PL X. fig. 1.) 



Orbitoides papyracea, Brady, Geol. Mag. 1875, pi. xiv. fig. 1, p. 535 



(non Boubee). 

 Lepidocyclina species g and k, Verbeek and Fennema, Descr. ge"ol. de 



Java et Madoura, 1896, vol. i. pi. xi. figs. 173-175, 177-180, vol. ii. 



p. 1178. 



In the volume of the l Geological Magazine ' referred to 

 above the late Dr. Brady described and figured certain 

 Orbitoides and other Foraminifera from Sumatra. The 

 specimens were supplied by Dr. Verbeek, and they are now 

 preserved partly in the British Museum (Nat. Hist.) and 

 partly in the University Museum of Zoology at Cambridge. 

 Certain of the Orbitoides were referred by Dr. Brady to 

 0. papyracea, Boubee, and were so figured in the plate xiv. 

 illustrating his paper. 0. papyracea, Boubee, however, 

 belongs to Gumbel's subgenus Discocyclina, having the 

 chambers of the median plane rectangular ; but Brady's 

 Sumatran specimens have the chambers of the median plane 



