MILIOLIDAE - Acta Palaeontologica Polonica

76 EWA LUCZKOWSKA
similar tubular chambers initially and angular in the mature stage only,
while :n C. gracilis they remain tubular throughout ontogeny. The rough
streaky surface resembles that of Cycloforina contorta striata (Asano), but
this species has a more oval and flattened test. The specimens of C. contorta
froin Steinabrunn in the Vienna Basin have also a rough streaky
surface. Our specimens somewhat resemble Cycloforina latidorsata (Reuss),
from which they however differ in having a more elongated, slender test.
Distribution. - Poland: Tortonian (Benczyn, Bogoria, Gliwice Stare,
Korytnica, Niechobrz, Rybnica, Wieliczka). Austria: Tortonian, the vicinity
of Nussdorf, Vienna Basin. Hungary: Tortonian and Sarmatian of the
Mecsek Mts. USSR: Upper Eocene, South Ukraine; Middle Miocene, West
Ukraine.
Cycloforina cristata (Millett, 1898)
(PI. XIII, Fig. 7a-c)
1898. Miliolina cristata Millett; F. W. Millett, p. 506, PI. 12, Fig. 3a-c.
Material. - 5 specimens (ColI. No. F-126)
Dimensions. L 0.28-0.32; B 0.20-0.24; T 0.13-0.14.
Descriptions. - Test small, broadly oval, periphery acute, serrated;
chambers slightly inflated, broad, with serrated edges, the denticles are
irregular in shape and number, from 7 to 10 on each chamber, middle
chamber small, with a prominent edge, fifth chamber clearly visible;
sutures depressed, distinct; wall thin; surface smooth, polished; aperture
circular at the end of a short neck, with a simple tooth.
Variability. A distinctive feature of the species are sharp, serrated
edges. The convexity of chambers and the number of denticles are
variable.
Distribution. - Poland: Lower Sarmatian (Zrecze). Recent, Malay Archipelago.
* Cycloforina fluviata (Venglinsky, 1958.)
(PI. XIII, Fig. 4a-c; Text-fig. 27/2).
1958. Miliolina fluviata Venglinsky; I. V. Venglinsky, p. 82, PI. 15, Figs 4, 5.
1962. Quinqueloculina fluviata (Venglinsky). I. V. Venglinsky, p. 73, PI. 4, Fig. 2a-c.
Material. - 20 specimens (ColI. No. F-127, Sec. No. 367).
Dimensions. L 0.40-0.46; B 0.25-0.27; T 0.18.
Description. - Test oval-quadrangular, periphery rounded; chambers
broad and inflated at the bottom and narrowing towards the end, middle
chamber elongated, slightly oblique, fifth chamber poorly visible; sutures
slightly depressed, indistinct; wall thin; surface with longitudinal thick
protuberances accumulated at the bottom of chambers and disappearing
towards the end; aperture round or semicircular, flush with the periphery,
with a short and quadrate tooth.