MILIOLIDAE - Acta Palaeontologica Polonica

MILIOLIDAE FROM MIOCENE OF POLAND 137
Material. - About 300 specimens (ColI. No. F-188, Sec. No. 188-197).
Dimensions: L 0.4-1.0; B 0.34-1.0; T 0.24-0.9.
Description. - Test irregularly circular, oval-triangular in crosssection;
two last chambers broad, inflated, tapering at both ends, with
two prominent edges on the periphery; these edges are wide apart, more
or less acute and sometimes sinuous; third chamber small, slightly convex,
oval, with one edge on the periphery; sutures depressed; wall thick;
surface smooth, polished; aperture circular-triangular, with a short and
bifid tooth.
Variability and ontogeny. This characteristic species is variable in the
form of chamber edges, which range from slightly marked edge to
prominent flexuose keel. The internal structure is irregularly triloculine.
The initial part consist of about 5 tubular chambers, the succeding 2-3
chambers are with one edge on the periphery and only in the adult stage
two edges occur on the chambers. The specimens sectioned belong to the
micro generation; PD 30 fA. (Text-fig. 46/4).
Remarks. - Compared with Karrer's illustration of the species, our
form is somewhat larger and with less prominent edges. The specimens
from Buitur and Voslau show as variable chamber edges as those in our
specimens from Karsy. The same variability is observed in Triloculina
marioni Schlumberger, found by the author in comparative materials from
the Adriatic Sea, from Punta Grossa near Triest, and regarded as a
synonym of T. intermedia. It differs from T. affinis d'Orbigny in its much
shorter, laterally expanded test.
Distribution. - Poland: Lower Tortonian (Karsy, Korytnica, Niskowa).
Austria: Tortonian, Voslau. Greece: Upper Pliocene, Rhode Island. Romania:
Tortonian, Kostej in Banat, Buitur. USSR: Middle Miocene,
Volhyn-Podolian Platform, Precarpathian Foredeep, Transcarpathians.
Recent: Mediterranean Sea.
X Triloculina neudorfensis Toula, 1900
(PI. XXIII, Fig. 4a, b; Text-fig. 46/3)
1900. Triloculina neudorfensis Toula; F. Toula, p. 11, PI. 12, Fig. 2a-c.
1867. Triloculina tricarinata d'Orbigny; A. E. Reuss, p. 55, PI. 2, Fig. 4a-c.
Material. - 40 specimens (ColI. No. F-189, Sec. No. 189).
Dimensions: L 0.6-2.5; B 0.35-2.1; T 0.35-1.8.
Description. - Test oval or broadly oval, tapering at both ends,
triangular with concave sides in cross-section; chambers very broad, with
concave periphery and acute edges, with a broad border along the sutures,
middle chamber small, nearly flat; sutures slightly depressed; wall thin;
surface smooth, polished; aperture triangular-rounded, with a long and
bifid tooth.