MILIOLIDAE - Acta Palaeontologica Polonica

86 EWA LUCZKOWSKA
cunata (Venglinsky) in its oval test shape, tapering at both ends, in the
rounded, not compressed periphery, the broad, not depressed sutures, and
the circular aperture with a narrow and bifid tooth.
Distribution. - Poland: Lower Sarmatian, (Budy, Grzyb6w, Mielec,
Niwka, Rytwiany).
x Cyclojorina suturalis (Reuss, 1850)
(PI. XII, Fig. 5a-c; Text-fig. 27/3)
1850. Quinqueloculina suturalis Reuss; A. E. Reuss, p. 385, PI. 50, Fig. 9.
1867. Quinqueloculina suturalis Reuss; A. E. Reuss, p. 60, PI. 3, Fig. 1.
Material. - About 150 specimens (ColI. No. F-137, Sec. No. 362, 363).
Dimensions: L 0.23-0.65; B 0.20-0.45; T 0.15-0.35.
Description. - Test small, regularly oval, narrowing at both ends,
periphery rounded; chambers tubular, arcuate, of uniform width, middle
chamber large, very convex, fifth chamber small, clearly visible; sutures
distinct, depressed; surface smooth, polished; aperture small, flush with
the periphery, circular or semicircular, with a somewhat everted border
and a short quadrate, slightly bifid tooth.
Variability. The characteristic features of the species are the regular,
compact test shape and tubular chambers. The outline of the test varies
from broadly oval to narrowly oval, its thickness being different in
individual specimens. The aperture of young specimens is circular, in the
mature specimens ranging from circular to semicircular or even extending
transversely. The tooth shape is also variable, from short and bifid to
quadrangular and tape-shaped, as in Varidentella. C. suturalis seems to
belong to the group of forms, from which the species of Varidentella
in the Lower Sarmatian originated.
Dimorphism and ontogeny. The specimens sectioned belong to the
micro generation; PD 30 ./-l (Text-fig. 27/3). The sections show about
12 semicircular chambers, slightly compressed at the periphery and
gradually increasing in size.
Remarks. - The specimens investigated were fourid in the topotype
materials from Wieliczka and its vicinity. They are more regular than
that figured by Reuss in 1850 and emended later in 1867, have
a thicker test and a less rounded shape. Considering however the fact that
the species has been described from the salt clays in Wieliczka and
a thorough examination of these deposits did not result in the founding of
specimens more resembling Cyclojorina suturalis than those described
above, they may most probably be assigned to this species. It is similar
to Quinqueloculina regularis (Reuss), which however differs in the distinct
rhomboid test shape, trapezoid outline of chambers in cross-section and
triangular shape of the aperture. It somewhat resembles Cyclojorina
hauerina (d'Orbigny), in having tubular chambers, but this species differs