MILIOLIDAE - Acta Palaeontologica Polonica

128 EWA LUCZKOWSKA
the aperture, the thicker tooth, and in having usually three chambers
visible from outside.
Distribution. - Poland: Tortonian (Karsy, Korytnica, Rybnica, W~glinek,
Wieliczka, Zrecze). Austria: Tortonian, Nussdorf, Vienna Basin.
lmm
Fig. 42. Morphological variability and internal structure of Sinuloculina mayeriana
(d'Orbigny), Upper Tortonian, Wl:glinek, micro (?) generation; 1,3 - flattened forms,
initial part cryptoquinqueloculine, then in a single plane; 2,4- inflate forms, cryptoquinqueloculine
throughout; a front side, b apertural view, c cross-section.
+ Sinuloculina microdon (Reuss, 1850)
(pI.XXV, Figs 3a-c, 4; Text-fig. 43/1)
1850. Triloculina microdon Reuss; A. E. Reuss, p. 382, PI. 49, Fig. 9.
Material. - About 100 specimens (ColI. No. F-181, Sec. No. 178).
Dimensions: L 0.6-1.1; B 0.25-0.47; T 0.2-0.3.
Description. - Test slender, nearly quadrangular, flattened, periphery
rounded; chambers tubular, expanding and bending at the base,
straightened towards the aperture, middle chamber narrow, elongate,
slightly convex, in somewhat oblique position; three chambers visible
from outside; sutures distinct, undulating, with a small border along the
chamger edge; wall thin; surface smooth, polished; aperture circular, large,
even with the periphery, and with a short, tooth, bifid at the end.
Variability. The test shape varies from nearly quadrangular to more
oval, narrowing at both ends. Some specimens are with longitudinal