MILIOLIDAE - Acta Palaeontologica Polonica

80 'EWA LUCZKOWSKA
Dimensions: L 0.5-0.65; B 0.3-0.4; T 0.2-0.3.
Description. - Test regular, oval, periphery rounded; chambers tubular,
narrow, in the lower part strongly inflected, middle chamber large,
distinct, convex, fifth chamber clearly visible; sutures depressed; surface
smooth, dull; aperture circular, small with a simple or slightly bifid tooth,
placed on a slight extension of the last chamber.
Variability. The characteristic features of the species are the regular
oval test shape and tubular chambers. Morphological variability is inconsiderable.
Dimorphism and ontogeny. The cross-sections present semicircular
chambers of uniform shape, slightly increasing in size; PD 40f! (Text-fig
28/5). The specimens sectioned represent the micro generation.
Remarks. - This species somewhat resembles the forms referred to as
Quinqueloculina seminulum (Linne), but has its test much more approximating
to oval and inflated, not flattened, sides of chambers. It has not
been found in materials from Baden, from where the species was described,
but numerous forms identical with ours occur at V6slau. In comparison
with the illustration of d'Orbigny from 1846, both the forms from V6slau
and ours are somewhat thicker, and more slender, and show a small
extension of the last chamber in some specimens. From Cycloforina gracilis
(Karrer) our forms differ in the more oval shape of the test and in
the smooth and dull, not streaky, surface of chambers.
Distribution. - Poland: Tortonian (Bogoria, Bogucice, Brzeinica,
Chelm n/Rab~, Gieraszowice, Grabki Duze, Grabowiec, Iwkowa, Niskowa,
Rybnica, W€;glinek). Austria: Tortonian, vicinity of Baden, Vienna
Basin.
* X Cyclojorina karreri ovata (Serova, 1955)
(PI. XIII, Figs 1a-c, 2a-c, Text-fig. 29/3, 30)
1955. Miliolina costata (Karrer) var. ovata Serova; M. J. Serova, p. 320, PI. 9,
Figs 10-12.
1958. Miliolina karreri (Reuss) var. ovata Serova; 1. V. venglinsky, p. 68, PI. 9,
Fig. 3a-c.
Material. - Over 100 specimens (ColI. No. F-131, Sec. No. 302, 303).
Dimensions: L 0.23-0.55; B 0.1-0.4; T 0.1-0.23.
Description. - Test oval or narrowly oval, periphery rounded; chambers
tubular, of almost uniform width, middle chamber strongly elongated,
slightly projecting above the surface, fifth chamber distinct; surface of
all chambers covered with longitudinal, occasionally bifurcate, little ribs,
the number of which oscillates between 10 on the last chambers and 4-6
on the middle one; sutures distinct, depressed; wall thin; aperture circular
placed at the end of a short neck and with a low quadrate, slightly
bifurcated tooth.