MILIOLIDAE - Acta Palaeontologica Polonica

MILIOLIDAE FROM MIOCENE OF POLAND 79
Remarks. - This species is closely related to Cycloforina lucida
(Karrer) and CyclO'jorina contorta (d'Orbigny). It however differs from
the former in the more solid compact structure of the test, its less elongated,
oval-quadrangular shape and no tendency to the flattening of chambers
and from the latter in lacking sharp carinae on the chamber edges;
but there are transitional forms between these two species.
Distribution. - Poland: Tortonian (Brzeznica, Chelm n/Rabll, Gliwice
Stare, Karsy, Korytnica). Czechoslovakia: Lower Tortonian, Zidlochovice.
Romania: Lower Sarmatian, the Moldavia Platform. USSR: Neogen, Holubica
near Pieniaky; Konka (Middle Miocene), North-Western Precaucasus,
Crimea and West- and South- Ukraine; Meotis (Pliocene)
Precaucasus.
* Cycloforina gracilissima (Bogdanowich, 1950)
(PI. XIII, Fig. 6a-c)
1950b. Miliolina lachesis (Karrer) var. gracilissima Bogdanowich, p. 149, PI. 2,
Fig.4a-c.
1952. Miliolina gracilissima Bogdanowich; A. K. Bogdanowich, p. 109, PI. 10, Fig. 4a-c.
Material. - 20 specimens (ColI. No. F-129).
Dimensions: L 0.35-0.43; B 0.20-0.28; T 0.15-0.20.
Description. - Test very small, oval, narrowing at both ends, periphery
angular with 2-3 sharp costae, which may be irregular, somewhat
sinuate in outline or bifurcate at the bottom of chambers; chambers wide
and inflated in the lower part and strongly narrowing toward the end,
last chamber with a short neck, slightly expanded near the aperture,
middle chamber inconspicuous, with 1-2 carinae; sutures distinct, depressed;
wall thin, occasionally translucent; surface smooth, polished;
aperture circular at the end of a short neck, with a small, quadrate tooth.
Variability. Typical features of the species are considerable chambers
enlarged in the lower part and contracted in the upper part and the
presence of irregular costae. The degree of expansion of the chambers
and undulation of costae is variable.
Remarks. - Our forms have no such sharp carinae, as those in the
species figured by Bogdanowich, but the other features of these two forms
are coincident. No resemblance to Cycloforina lachesis (Karrer), suggested
by Bogdanowich is observed.
Distribution. - Poland: Lower Sarmatian (Rytwiany, Zrecze). USSR:
Tchokrak (Middle Miocene), West Precaucasus.
+ Cycloforina hauerina (d'Orbigny, 1846)
(PI. XII, Fig. 1a-c, Text-fig. 28/5)
1846. Quinqueloculina hauerina d'Orbigny; A. d'Orbigny, p. 286, PI. 17, Figs 25-27.
Material. - 70 specimens (ColI. No. F-130, Sec. No. 369, 370).