609 
Permadi in the North old Miocene to Oligocene deposits are spread 
over a vast area. 
All Lepidocyelina limestones are very pure. 
Il. The Operculina and Heterostegina-limestones. Three more 
limestones originate from the neighbourhood of the Went-mountains, 
which differ rather much from the preceding. Two boulders, each of 
which bear the numbers 542. 1909 were found in the Bibis-River. 
The one is a rather crystalline, reddish-gray limestone with scanty 
quartz-splinters. It contains many badly preserved Heterosteginae. The 
other is a glauconitie limesandstone, in which besides numerous 
grains of quartz many Operculinae and traces of Heterosteginae are seen. 
A whitish-gray, sugar-grained limestone from mount Permadi 
(N°. 349. 1907) contains besides numerous quartz-grains badly 
preserved small Rotalidae, Textularidae, Miliolidae and other small 
Foraminifera-remains, also numerous small Operculinae. 
A glauconitie, quartz-rich limestone from the Went-mountains 
(N°. 616. 1919) contains besides occasional Operculinae and 
Miliolidae, also very numerous small Heterostegina. They are small 
(horizontal section 2—3 mm., vertical section 1 mm.) knob-shaped 
fossils; built up almost entirely of spirals, which embrace each 
other. The surface is covered with numerous thick tubercles, which 
constitute the basal part of conic columns of intermediate skeleton. 
These tubercles are connected by thin, irregular bands. In the 
transverse section these fossils bear a strong likeness to small 
Nummulites, in the median section, however, we see that they are 
small Heterosteginae, which nearly always lack the peripheral, 
evolute skeleton part common among this genus. They are indivi- 
duals of Heterostegina (Spiroclypeus) pleurocentralis Carter. 
Nothing can be said for certain about the age of the discussed 
Opereulina- and Heterostegina-limestones, but it is very probable 
they belong to the same formation as the Lepidocyclina-limestones. 
It is remarkable that all the Operculina-Heterostegina-limestones 
contain quartz-grains or quartz-splinters, that even some are true 
Jime-sandstones. 
Il. Crystalline limestones from the Hellwig chain. Highly erystal- 
line sugargrained, gray to grayish-red limestones without recogni- 
zable fossil-remains were collected in the Hellwig-mountains (N°. 337, 
1907; 650, 652, 666, 1909) and on mount Kristal (N°. 342, 1907). 
We must admit complete ignorance of their age. 
IV. Vhe Alveolina- and the Lacazina-limestones. A number of 
Kocene limestones, in which Alveolinae or Lacazinae predominated 
alternately, were collected as boulders or were found as solid 
