1143 
Malinam (Melinan), an affluent of the Sungei Barram, oligomiocene 
Orbitoides (Lepidocyclina Verbeeki Newt. and Holl.) as well as 
eocene Orbitoides and Nummulites. 
Whereas we know nothing about the nature of the sediments 
from which the oligomiocene fossils described by Newton and 
HorLanD originate, we have a fair knowledge of the composition 
of the deposits of Brunei, Klias and Labuan which are considered 
to be eocene. According to C. Scumipt’s (l.c.) descriptions and profiles 
we have to do here with an oil-bearing formation of several thousands 
of metres thickness, made up of a highly folded series of sand- 
stones, marls, shales, limestones, conglomerates and coal. Numerous 
oil-localities and important mud-voleanoes prove this formation to 
have been rich in oil originally. 
In 1914 I received from the late Dr. G. NierHAMMER some frag- 
ments of limestone from the tertiary of the peninsula of Klias. Some 
time ago Dr. W. Horz of Basle sent me a small collection of rocks 
and boring-samples, some of which had been collected by NieTHAMMER, 
others by himself. This small collection derives its interest from 
belonging to different stratigraphic horizons. A fragment of lime- 
stone originates from Pulu Burung to the south of Labuan; according 
to C. Scumipr (lc.) the islet rests upon a syncline, so that the lime- 
stone is sure to belong to the more recent horizons of the formation. 
Another fragment was found by Horz on the small island on the 
westcoast of Klias, which, according to Scumipr. was formed during 
the eruption of a mud-voleano on the 21st of September 1897 on 
the axis of a deeply folded anticline. Various pieces of limestone 
were collected on Klias on the surface. From the boring 1 of the 
Dutch Colonial Oil-Company on Klias I obtained samples, that were 
brought up from depths of from 773 to 1480 feet. Finally Horz 
collected a fragment of limestone on a cliff to the north of the 
isle of Tega, situated to the North of Klias. 
The rock I received from Dr. NieTHAMMER in 1914 is a yellowish- 
grey, rather crystalline reef limestone on whose surface with the aid 
of a loupe Cycloclypeus communis Martin, Heterostegina depressa 
d’Orb., small Lepidocyclines and Corals can be recognized. In thin 
sections it can be seen, that some of the Lepidocyclinae are charac- 
terized by small dimensions, by scarce thick skeleton-columns centrally 
arranged, and by median chambers, which become higher towards 
the periphery, and on this account must be classed along with 
L. Munieri Lem. et Douv. From one particular specimen we con- 
cluded that the fossils are megalospherical and that the embryonic 
chambers are of the kidney-shaped type. Furthermore the thin sections 
