( 1132. ) 
O. (Lepidocyclina) flexuosa n sp. 
A second form of Sungei Blakin is somewhat. less numerous 
than the former, I could dispose of about 20 specimens agreeing 
very well with each other. The Foraminifera consist of a lens- 
shaped body surrounded peripherally by an edge which is strongly 
plaited in a vertical direction (flexuosa). The horizontal diameter is 
4—7 m.m. the vertical one about 3 m.m. At the surface one sees 
distinctly, especially in the centre, the wart-shaped extremities of 
many not thick skeleton-columns between the lateral chambers 
enclosed in irregular polygons. 
Horizontal section. On account of the strong bend of the median 
plane in a horizontal section of course only irregular areas of median 
chambers can be hit. Again the embryonal chamberlet must be very 
small; it is however not hit in a single section. The first peripheral 
chambers lie irregularly round the centre; those lying farther outside 
seem to be placed in regular concentric rings. Near the centre the 
median chambers are again flattened in a radial direction; d 40u rad. 
and 55u tang. More towards the peripbery the median chambers 
become first hexagonal, afterwards rhombus-shaped or spatulate, it 
seems that the rhombus-shaped chambers have the majority. The 
dimensions of these peripheral chambers are: d 20—420w rad., 
60—100u tang. The number of concentric chamber-rings amounts 
to 50—100. 
Likewise in this form a primary lamella can be distinguished at 
the parietes of the median chambers, the secondary thickenings of 
the parietes change here gradually into the later chamber-filling. The 
shape of the median lamellas is typical, each ventricle is bounded 
by a peripheral arched piece, that 
passes into two radial parts whilst 
at the central side two arched pieces 
are found (fig. 3). Pori between the 
median chambers could not be dis- 
covered with certainty. 
The lateral chambers are in this 
section likewise enclosed in irregular 
polygons, their parietes are very 
thick; they correspond by means of 
rare, very wide, horizontal pori, whilst 
at favourable places one sees exactly 
into the openings of numerous ver- 
tical pori. 
