608 
the slow increase of the height of the whorls, they are like Operculina 
with regard to the inconsiderable investment and the texture of the 
wall. They are of no stratigraphical significance whatever. 
Besides the fossils recorded also the following occur: small Lepi- 
docyclinae (629. 1909), Cycloclypeus (85. 1907),? Polystomella 
(85. 1907), Gypsina (680 and 631, 1909), Rotalidae (544. 1909), 
and? Orbitolites (85. 1907). The occurrence of Alveolinae with 
only one layer of chambers per whorl (85. 1907) strikes us as 
very remarkable. Also in West New-Guinea near Karas traces of 
these primitive Alveolinae were found in a Lepidocyclina 
limestone ') 
It appears from the frequent occurrence of large Lepidocy- 
clinae and of primitive Alveolinae, that the rocks described belong 
to the oldest Miocene or to the Oligocene. 
A boulder from the slope of mount Permadi (452 m.) (no. 353 
1907) differs from the above rocks only in that among the fossils 
small Lepidocyclinae prevail. Very much like it again is a gray 
limestone from the Went-chain, which contains besides very few 
large Lepidocyclinae and numerous Heterosteginae, also Gypsina, 
Alveolina s.str., Amphistegina,? Calcarina, Rotalidae and Lithothamnium 
(N°. 623, 1909). 
A very striking difference exists between the rocks thus far described, 
and a boulder from Sabang (N° 84. 1907), which abounds 
in Corals and Lithothamnia, but contains only traces of Lepidocyclinae. 
A boulder from the Koekoek-River (N°. 328, 1907) contains 
Cyeloelypeus annulatus Martin, small Lepidocyclinae with very thick 
tubercles, Globigerinae and Corals. 
Four roeks from the Resi-mountains N°. 310, 311, 312, 361. 1907) 
and a boulder from Geitenkamp (N°. 170, 1907), make up the 
rear in the series of Lepidocyclina-rocks. They are all grayish- 
white, rather crystalline limestones, which no doubt belong together, 
though not all of them are characterised by typical fossils. Small 
Lepidoeyelinae occur in 170 and 310. 1907, badly preserved 
Nummulinidae in 310, 811, 361. 1907, other badly preserved 
Foraminiferae in 170, 310, 314. 1907; Lithothamnium in 170 and 
311. 1907 and badly preserved Corals in 170, 310, 361. 1907. 
It has thus been proved that in the basin of the Bibis-, Lorentz-, 
and Reiger-Rivers neogenic Lepidocyclina-bearing rocks must oceur. 
Of the two first-named basins also the solid rock is known: 
in the region between the Resi-mountains in the South and Mount 
1) L. Rurren. Nova Guinea, l.c. p. 38. 
