2 
( 1135 ) 
Subgenus novum Lepidosemetyclina. 
Besides the Orbitoides described I found in the marl of the Sungei 
Blakin still numerous Forminifera, which offer in several respects 
great affinity with Lepidoeyelina. With those too a system of median 
chambers exists, which in general have on the horizontal section a 
spatulate shape, and develop themselves round a few large embryonal 
chambers; with those too on either side of these median chambers 
there are lateral ventricles, of an irregular shape, and between these 
a supporting skeleton is found, ending at the surface in numerous 
warts. In one respect however these forms show great differences 
with Lepidoeyelina: the median chambers namely do not lie in 
concentric rings, but only in half- or quarter-circles, in which the 
embryonal chambers are lying at the periphery, in the central point 
of the circle-sector. Consequently a new subgenus was introduced 
for these forms: Lepidosemicyclina. 
Lepidosemicychina thecideaeformis n. sp. 
At the Sungei Blakin occurs only one species of this subgenus having 
usually the shape of a circle-sector of somewhat less than 180°, 
and being a little thickened in the central point of the circle, so 
that the little shells make us think of Brachiopod Thecidea. One 
side of the shell is often more convex than the other, the latter can 
even be concave, so that the horizontal median plane is no longer a 
pure symmetrical plane. At the surface there is no vestige of lateral 
or median chambers; the whole disk is covered with little densely 
accumulated warts. There is some variety in the general shape, 
because now the tangential, now the radial diameter is the larger, 
(2—4 mM.) Sometimes the shell is slightly bent, in most cases however 
quite flat. 
Horizontal section. In a good section one sees distinctly the large 
embryonal chamber, which lies a little beside the central point of 
the circle. It is large and round, and its parietes are thick (d. 160 
thickness of the parietes 20 u). With this embryonal chamber is 
connected a still larger chamber, which lies at the extremity of the 
shell, i.e. in the central point of the circles and partly surrounds 
the embryonal chamber. Its peripherie parietis is still thicker than 
that of the embryonal chamber (80 u); the borderparietis is only 
15 u thick. Two more large chambers, lying more to the centre, 
are connected with this second parietis; these three ventricles sur- 
round the embryonal chamber in an indistinct spiral. The following 
