MILIOLIDAE - Acta Palaeontologica Polonica

94 EWA LUCZKOWSKA
Distribution. - Poland: Lower Tortonian (Benczyn, Karsy, Korytnica).
Czechoslovakia: Lower Tortonian, Zidlochovice. Romania: Tortonian, Kostej
in Banat.
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Fig. 33. Morphological variability, ontogeny and internal structure of Lachlanella:
1,2 - L. incTassata (Karrer), Lower Tortonian, Korytnica, micro generation; 1-form
with subquadrate chambers; 2 - form with quadrate chambers; 3,4- L. schToekingeTi
(Karrer), Lower Tortonian, Korytnica, micro generation; 5,6- L. undosa (Karrer),
Upper Tortonian, WE:glinek, micro generation; a front view, b aperture view, c crosssection.
Lachlanella schroeckingeri (Karrer, 1868)
(PI. X, Fig. 4a-c, Text-fig. 33/3, 4)
1868. Quinqueloculina schToeckingeTi Karrer; F. Karrer, p. 149, PI. 2, Fig. 12.
Material. - 15 specimens (ColI. No. F-148, Sec. No. 163, 164).
Dimensions: L - 0.85-1.25; B - 0.5-0.7; T - 0.35-0.50.
Description. - Test quadrangular-oval, tapering somewhat at the base,
periphery angular, broad and somewhat keeled; chambers with concave
sides, of uniform width, strongly bent basically, each of them provided
with two edges somewhat sinuate in outline, middle chamber large,
slightly convex, also with two sinuous edges specifically bent in the lower
part; sutures flat, distinct; surface matt, covered thickly with irregular
short longitudinal strips; wall thin; aperture narrow, high, with a long
simple tooth.
Variability. Prominent features of the species are two sinous bent edges
on the periphery and the matt surface with irregular strips. The test
shape shows little variation.
Dimorphism and ontogeny. The specimens sectioned are microspheric;
PD - 30Jl. The sections show that the juvenile stage is composed of 2-3