MILIOLIDAE - Acta Palaeontologica Polonica

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144 EWA l.UCZKOWSKA Variability. The border of the aperture may be more or less everted, the shape of tooth varies from broad tape to narrow ridge or may be reduced, leaving only small traces (Text-fig. 50). Dimorphism and ontogeny. The sections show the mega I (?) generation; PD 60--80 fl. The internal structure is cryptoquinqueloculine (Text-fig. 50); there is a turn in the coiling axis by about 90° after the juvenile stage. lmm Fig. 50. Morphology and internal structure of VaridenteUa rosen (d'Orbigny), Lower Sarmatian, Budy-l borehole, depth 190.8-190.9 m, mega I generation; I-large specimen with qUinqueloculine chamber arrangement; 2 - irregularly cryptoquinqueloculine chamber arrangement; 3, 4 - small specimens with turn of coiling axis visible in juvenile stage; a front view, b apertural view, c cross-section. Remarks. - This species differs from Cycloforina stomata sp.n. in its more circular shape, more inflated chambers, depressed sutures, semicircular, large aperture and small, tape-like tooth, from Varidentella rotunda (Gerke) in much more inflated chambers and depressed sutures and from Sinuloculina rotunda (d'Orbigny) in having a more circular test, more inflated chambers and broad semicircular aperture with a tape-like tooth. Distribution. - Poland: Lower Sarmatian, (Budy, Dwikozy, Grzyb6w, Mielec, Rytwiany, Wierzchowiska, Zrecze). Cuba: Recent.
MILIOLIDAE FROM MIOCENE OF POLAND 145 Varidentella rotunda (Gerke, 1938) (PI. XXVII, Figs 5a-c, 6; Text-fig. 51) 1938. Miliolina akneriana (d'Orbigny) var. rotunda Gerke; A. A. Gerke, p. 296, PI. 1, Fig. 1. 1950b. Miliolina akneriana (d'Orbigny) var. rotunda Gerke; A. K. Bogdanowich, p. 145, PI. 1, Fig. 10. 1952. Miliolina akneriana (d'Orbigny) var. rotunda Gerke; A. K. Bogdanowich, p. 113, PI. 11, Fig. 2. 1955. MiZioZina akneriana (d'Orbigny) var. rotunda Gerke; M. J. Serova, p. 323, PI. 10, Figs 7-9. Material. - Over 100 specimens (ColI. No. F-195, Sec. No. 358, 359, 368, 373-378). Dimensions: L 0.45-0.8; B 0.37-0.65; T 0.27-0.45 Description. - Test circular-oval, subtriangular in cross-section, periphery rounded; chambers broad, arcuate, slightly narrowing towards the aperture, with flattened sides, middle chamber oval, convex, fifth chamber poorly visible or invisible; last chamber often extended and inclined towards penultimate one, and thus the middle chambers have an oblique position; sutures indistinct; surface smooth, polished; wall thin, occasionally lmm @ ~~~ ~ C7. 00 2c 3c 4c Fig. 51. Ontogeny and dimorphism of Varidentella rotunda (Gerke), Lower Sarmatian, Grzyb6w 28 borehole, depth 159.8-160.0 m: 1-micro generation with cryptoquinqueloculine internal structure; 2,3 - mega I (1) generation with irregularly quinqueloculine internal structure; 4 - juvenile specimen of micro generation with turn of coiling axis visible in juvenile stage; a front view, b apertural view, c crosssection. 10 Acta Palaeontologica nr 1/74
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MILIOLIDAE - Acta Palaeontologica Polonica

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