MILIOLIDAE - Acta Palaeontologica Polonica

MILIOLIDAE FROM MIOCENE OF POLAND 77
Variability. A characteristic feature of the species is its nea.rly quadrangular
test shape and longitudinal protuberances on the periphery
of the lower part of the chambers. The shape of chambers is variable,
being straight or arcuate in the upper part.
Dimorphism and ontogeny. The specimen sectioned is microspheric;
PD 20f,l. The section shows a constant chamber shape during the ontogeny
(Text-fig. 27/2).
Fig. 27. Internal structure of Cyclojorina: 1 - C. stomata sp. n., Lower Sarmatian,
Budy-1 borehole, depth 212.7-212.8 m, micro generation; 2 - C. fluviata (Venglinsky),
Lower Sarmatian, Zrecze-3 borehole, depth 11 m, micro generation; 3 - C. suturalis
(Reuss), Lower Tortonian, Wieliczka, micro generation; 4 - C. predcarpatica (Serova),
Lower Sarmatian, Zrecze-3 borehole, depth 11 m, micro generation; a front view,
b apertural view, c cross-section.
Remarks. - This species differs from Cycloforina predcarpatica (Serova)
in possessing longitudinal protuberances on the lower part of its
much more inflated chambers.
Distribution. - Poland: Lower Sarmatian, southern border of the
Holy-Cross Mts (Dwikozy, Rytwiany, Zrecze). Bulgaria: Lower Sarmatian,
North-Western Bulgaria. Romania: Lower Sarmatian, Moldavia Platform.
USSR: Lower and Middle Sarmatian, Precarpathians and Transcarpathians.
Cycloforina gracilis (Karrer, 1867)
(PI. XII, Fig. 3a-c. Text-fig. 28/1)
1867. Quinqueloculina gracilis Karrer; F. Karrer, p. 361, PI. 3, Fig. 2.
1952. Miliolina gracilis (Karrer); A. K. Bogdanowich, p. 130, PI. 15, Fig. 4a-c.