MILIOLIDAE - Acta Palaeontologica Polonica

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142 EWA LUCZKOWSKA tooth varies from slight ridge-like swelling at the base of· the aperture to low transverse tape. There occur longitudinal irregular wrinkles, like in Cyclojorina predcarpatica (Serova), in some specimens (Part I, PI. XIII, Fig. 2) probably representing gerontic stage of the species. lmm (1:1®3{~ -/'-.-//k ~,~,~, Fig. 48. Morphological variability and internal structure of VaridenteHa reussi (Bogdanowich), Lower Sarmatian, Miechocin 0-3 borehole, depth 54.6-55.7 m, rounded forms: I-micro generation with initial part irregular, then quinqueloculine; 2 micro generation, initial part with turn of coiling axis, later quinqueloculine; 3 - micro generation, initial part cryptoquinqueloculine, then quinqueloculine; 4 mega I generation with irregularly quinqueloculine internal structure; a front view, b apertural view, c cross-section. Dimorphism and ontogeny. The specimens sectioned belong to the micro generation, PD 20-40 ~l (Text-figs 48/1-3, 49/1-4) and to the mega I generation, PD 70 Il (Text-fig. 48/4). The internal structure is quinqueloculine or cryptoquinqueloculine. The juvenile stage of the micro generation is composed of about 7 chambers in a quinqueloculine arrangement, then the coiling axis turns by about 90 0 and the subsequent 2-3 chambers grow nearly perpendicularly to the main axis; finally the coiling axis may return to the previous direction and the mature specimens may have a quinqueloculine appearance. The juvenile specimens with transparent walls show a distinct oblique position of the middle chambers after the coiling axis has been changed (Part I, PI. XIII, Fig. 3). Remarks. - This species differs from Varidentella sarmatica (Reuss) in its more compact, broadly oval or nearly circular shape of the test, low and broad aperture with tape-like tooth and dull, often wrinkled surface. From Cyclojorina stomata sp. n. it differs in slitlike, not circular aperture
<strong>MILIOLIDAE</strong> FROM MIOCENE OF POLAND 143 and in tape-shaped, not narrow and bifid tooth. From Varidentella latelacunata (Venglinsky) it differs in more circular test shape, lower aperture and tooth and flattened sutures. Our form corresponds to the comparative specimens of Varidentella reussi (Bogdanowich), kindly given the author by A. K. Bogdanowich, Fig. 49. Morphological variability and internal structure of Varidentella reussi (Bogdanowich), Lower Sarmatian, Miechocin 0-3 borehole 54.6-55.7 m, elongate forms: 1-4-micro generation, irregularly quinqueloculine chamber arrangement; a front view, b cross-section. they however differ from the comparative specimens of Varidentella sarmatica (Karrer) from Nexing in the Vienna Basin. Distribution. - Poland: Lower Sarmatian, (Mach6w, Miechocin, Mokrzysz6w, Piaseczno, Rytwiany). Austria: Lower Sarmatian, Nexing. USSR: Lower Sarmatian, Precaucasian and Ukraine. Varidentella rosea (d'Orbigny, 1839) (Pl. XXVII, Figs 9a-c, lOa, b; Text-fig. 50) 1839. TTiloculina rosea d'Orbigny; A. d'Orbigny, p. 69, PI. 3, Figs 1l~20; fide Catalogue Ellis & Messina. Material. - 60 specimens (CoIl. No. F-194, Sec. No. 135-138). Dimensions: L 0.3-0.65; B 0.27-0.54; T 0.2-0.35 Description. - Test nearly circular, periphery broadly rounded; chambers broad, inflated, middle chamber large, irregularly oval, strongly convex, fifth chamber poorly visible or invisible; sutures broad, depressed; wall thin; surface smooth, polished, covered with irregular transverse wrinkles in larger specimens; aperture large, semicircular, with small, ridge-like tooth, occasionally partly reduced or lacking; aperture border strongly sloping, sometimes nearly perpendicular to the periphery and everted in some specimens.
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lmm Fig. 17. Ontogeny and dimorphis
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