MILIOLIDAE - Acta Palaeontologica Polonica

MILIOLIDAE FROM MIOCENE OF POLAND 135
Material. - About 100 specimens (ColI. No. F-186, Sec. No. 191-196).
Dimensions: L 0.71-0.91; B 0.54-0.72; T 0.55-0.70.
Description. - Test broadly oval, tapering at both ends, roundedtriangular
in cross-section; chambers broad, with slightly inflated periphery
and rounded erges, extending not far from the sutures, middle
chamber inflated; sutures strongly depressed, distinct; wall thick; surface
smooth, polished; aperture circular, with a long tooth, bifid at the end.
Variability and ontogeny. The chambers may be more or less inflated,
and the edges more or less rounded, thus the cross-section may be
triangular or rounded-triangular in outline. The specimens sectioned
belong to the mega I generation, the PD is about 120 fl. The internal
structure is regularly triloculine (Text-fig. 46/2).
Remarks. - Compared with the specimens of Triloculina gibba from
Nussdorf and Voslau and with Recent specimens from the Adriatic Sea
lmm
2c
Fig. 46. Internal structure and morphology of Triloculina: 1-T. gubkini (Bogdanowich),
Upper Tortonian, W~glinek; initial part cryptoquinqueloculine, later pseudotriloculine,
micro (?) generation; 2 - T. gibba d'Orbigny, Lower Tortonian, Korytnica;
typical triloculine internal structure, mega I generation; 3 - T. neudorfensis Toula,
Lower Tortonian, Wieliczka; typical triloculine internal structure, mega II generation;
4 - T. intermedia Karrer, Lower Tortonian, Karsy; irregularly triloculine
internal structure, micro generation; a side view, b apertural view, c cross-section.