1144 
hi 
reveal Lithothamnia and Lepidocyclina. Another Lepidocyclina being 
of the shape of a double cone and microspherical, could be removed 
from the roek; it is closely allied to L. acuta Rutten. From the 
absence of Nummulites and large Lepidocyclinae on the one side 
and of Miogypsina on the other, and from the presence of L. acuta 
we are justified in concluding that the rock belongs to the middle 
part of the Lepidocycline-bearing tertiary, and, therefore, is most 
likely middle-old-miocene. 
It is not impossible that the rock described is derived from the 
same finding-place as another limestone of the Horz-collection, which 
was found by NreTHAMMER at the Sungei Silico (N°. 499). Here also 
may be recognized on the surface Heterostegina, small Lepidocyclinae 
and a few larger, flat Lepidocyclinae. In the thin sections of the rock 
it can be observed that the limestones are highly crystalline and 
that they include numerous Lepidocyclinae. Besides these also Cyclo- 
clypeus communis Martin, Heterostegina, Operculina, Carpenteria, 
Rotalidae and Lithothamninm occur. Most of the Lepidocyclinae 
belong to a small species; the horizontal diameter is from 2—3 mm. ; 
the vertical one from 1—1} mm. The fossils are megalospherical 
with kidney-shaped embryonic chambers; there are scarce, but very 
thick, centrally arranged skeleton-columns; the median chambers 
are higher towards the periphery, and often the plane of the median 
chambers is continued out of the proper body of the fossil, forming 
a collar round the lentoid centre. It is certain, that these fossils 
must be grouped along with the Lepidocyclina Munieri Lem. et 
Douv. Beyond these, some slightly larger, microspherical forms occur 
(horizontal diameter 3—4 mm., vertical diameter 1—14 mm.) distin- 
guished from the others by a flatter lentoid shape and by the occur- 
rence of numerous skeleton-columns evenly distributed over the 
whole body. 
Lastly there are some sections of a still larger species, whose 
diameter exceeds 6 mm., whose height, however, is no more than 
14 mm. It is evident, then that the fossils are very flat and the height 
of the chambers is accordingly insignificant. Probably they are 
microspherical. True skeleton-columns there are none, but the vertical 
walls between the lateral chambers are thickened rather considerably. 
Whereas the two forms first described belong still to the “ordinary” 
small Lepidocyclina, which characterize the middle-, and the most 
recent part of. the Lepidocyclina-bearing tertiary, the last-described 
form already begins to show analogies to the group of Lep. formosa 
Schl. (flatness, larger diameter, absence of skeleton-columns) which 
characterizes the lowermost part of the Lepidocyclina-bearing tertiary. 
