300 F. CHAPMAN. 
based on a collection of rocks made in Borneo by Dr. 
Buxtorf. It shows the Papuan series to be nearest related 
to Douvillé’s stage 10 or Upper Aquitanian, with a slight 
leaning towards the Lower Aquitanian indicated by the 
presence of ZL. Murrayana, J. and OC. (= L. formosa, 
Schl.). The Upper Aquitanian, however, contains the 
majority of genera and species found in the present series, 
as Heterostegina margaritata, Cycloclypeus communis and 
L. Verbeeki, the latter belonging to the Z. insulce-natalis 
group, with large or medium sized tests, small or unde- 
veloped pillars and closely-set and widely-expanded cham- 
berlets in the peripheral zone. The range of L. Murrayana 
(= L. formosa) moreover, is really of higher range in 
the geological scale than H. Douvillé sets forth in his table, 
for, as already remarked, this species belongs to the JL. 
dilatata group, which is characteristic of the Upper Aqui- 
tanian in Italy. In that country Dr. A. Silvestri has shown* 
that LZ. dilatata occurs in company with L., marginata, a 
species which is found in the Miocene of the Geelong 
District at Batesford, Victoria. 
In conclusion it may be noted that this occurrence of a 
Lower Miocene horizon in Papua is of exceptional interest 
as showing the existence of another link in the chain of 
localities where the beds of the old shore-line of the ancient 
Tethyan sea were laid down. It thus helps to connect with 
the Victorian occurrence at Batesford, in all probability 
by way of a portion of the lost shore-line indicated by the 
subsiding area now occupied in part by the Great Barrier 
Reef off the north-eastern coast of Australia: whilst a 
divergent arm extended as far as New Zealand, as shown 
by the occurrence of Lepidocyclince at Orakei Bay. 
1 « Distribuzione geographica e geologica di Due Lepidocicline comuni 
nel Terziario Italiano.” Mem. del Pont. Acc. Rom. d. Nuovi Lincei, vol. 
XxIx, 1911, p. 52. 
