MILIOLIDAE - Acta Palaeontologica Polonica

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104 EWA LUCZKOWSKA Remarks. - This species approach morphologically to Miliolinella circularis (Bornemann), but differs in having a quadrangular-oval test shape, not tapering at the end, in its rough surface, covered with transverse wrinkles, and in the broader aperture with a sickle-shaped tooth. It resembles also M. subrotunda (Montagu), but differs in the quadrangularoval test shape and in the tendency for its several last chambers to be arranged in a single plane. From M. dilatata (d'Orbigny) it differs in its more compact and higher test and more inflated chambers. Distribution. - Poland: Upper Tortonian (Ligota Zabrska, W~glinek, Wierzchowiska). Romania: Tortonian, Kostej in Banat. X Miliolinella enoplostoma grammostoma (Reuss, 1867) (pl. XX, Fig. 3a-c) 1867. Triloculina enoplostoma grammostoma Reuss; A. E. Reuss, p. 71, PI. 2, Fig. 5. Material. - 6 specimens (ColI. No. F-157). Dimensions: L 0.7-0.8; B 0.55-0.7; T 0.4-0.7. Description. - Test compact, nearly circular, triangular iIi crosssection, periphery broadly rounded; chambers inflated, with flattened sides, broad at the base and considerably narrowing towards the end, last chamber large, inflated, somewhat contracted at the periphery, middle chamber oval, distinct, occupying one-third of the breadth of the front side; sutures distinct, with slightly marked groove along the inner chamber edge; surface smooth, polished; aperture small, semicircular with a small semicircular flap, which is depressed in the middle. Variability. The flattening of the last chamber periphery is variable, which gives it its irregular, more or less triangular appearance in crosssection. Some specimens lack the flap in the aperture. Remarks. - The specimen figured originates from Wieliczka and coincides with the description of Reuss, the other specimens of this species found in Wieliczka are less regular in shape. It resembles Triloculina austriaca d'Orbigny in morphology, but differs in the aperture with a flap. It differs from Miliolinella valvularis (Reuss) in the marked flattening of the last chamber periphery, as in Triloculina, and in its much smaller aperture. The author expressed the opinion earlier (Luczkowska, 1967) that M. enoplostoma grammostoma corresponds rather to M. valvularis (Reuss). In fact, these two forms are very close to each other. Considering however that in Wieliczka only a few morphologically differentiable specimens of either species have been found, and none of the abundant specimens of M. valvularis from other localities of the Upper Tortonian has a flattened periphery of the last chamber, as in M. enoplostoma grammostoma, the subspecies from Wieliczka has been retained as valid. Distribution. - Poland: Tortonian (Wieliczka).
<strong>MILIOLIDAE</strong> FROM MIOCENE OF POLAND 105 MiZioZinella selene (Karrer, 1868) (Pl. XX, Figs 1, 2; Text-fig. 36) 1868. TTilocuZina selene Karrer; F. Karrer, p. 138, Pl. 1, Fig. 12. 1950b. MiliaZina selene (Karrer); A. K. Bogdanowich, p. 155, PI. 5, Fig. 3. 1952. Milialina selene (Karrer); A. K. Bogdanowich, p. 119, PI. 12, Fig. 1. 1959. Miliolina selene (Karrer); M. Stancheva, p. 243, PI. 3, Fig. 3. 1970. Quinqueloculina selene (Karrer); V. J. Didkovsky & Z. N. Satanovskaja, p. 32, PI. 18, Fig. 9 cum syn. 1971. Quinqueloculina selene (Karrer); B. Strashimirov, p. 131, PI. I, Figs. 13, 14. Material. - Over 500 specimens (CoIl. No. F-158, Sec. No. 289-293). Dimensions: L 0.45-0.8; B 0.35-0.6; T 0.25-0.4. Description. - Test elongate, oval, rounded-triangular in cross-section, periphery rounded; chambers broad, somewhat broader at the base and narrowing towards the aperture, semicircular in cross-section, with flattened sides, middle chamber oval, tapering at both ends, placed slightly obliquely; sutures flat, occasionally with a shallow groove along the chamber edges; wall thin; surface smooth, polished; aperture of variable shape, semicircular or transverse-slitlike, filled with a flap or with a tapeshaped arcuate tooth. Variability. - The thickness of the test and the rounded periphery are variable and, as a result, the test has a rounded-triangular or broadly oval shape in cross-section. The last chamber varies from broad to narrow. lmm Fig. 36. Morphological variability, internal structure and dimorphism of Miliolinella selene (Karrer), Upper Tortonian, Gliwice Stare; I-form with pseudotriloculine chamber arrangement, micro generation; 2,3 - forms with pseudotriloculine chamber arrangement, mega I generation; 4, 5 - forms with cryptoquinqueloculine chamber arrangement, mega I generation; a front view, b apertural view, c cross-section.
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MILIOLIDAE - Acta Palaeontologica Polonica

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