MILIOLIDAE - Acta Palaeontologica Polonica

MILIOLIDAE FROM MIOCENE OF POLAND 43
the megalospheric II generation only in their more slender shape and
thicker test, which is triangular or trapezoid, not rhomboid, in cross-section.
It may well be that the specimens of the megalospheric I generation
remain quinqueloculine in the mature stage, without attaining the massiline
arrangement of chambers.
Remarks. - Quinqueloculine forms resemble Quinqueloculina dutemplei
d'Orbigny but differ from it in having more numerous and finer ribs.
There is some similarity to Q. buchiana d'Orbigny in the shape of test
and in that there are occasional specimens among the massiline forms with
smooth early chambers, as in Q. buchiana, and ribbed later ones (PI. I,
Fig. 1). There are also forms with regular oblique wrinkles on the
peripheral part of the smooth chamber walls of the juvenile stage, as in
Q. buchiana, but in the later stage there appear ribs, as in Q. anagallis
(Text-fig. 11/4). Such wrinkles are here regarded as disturbances in the
normal continuous growth of chambers. Similar wrinkles, marked on the
inner borders of chambers, occur in some massiline specimens, in which
they r~.emble Q. haidingeri d'Orbigny (Text-fig. 11/1). Both species
mentioned differ however from our specimens in having no chamber wall
ornamentation at all.
Massiline forms are similar to Massilina pulchra Cushman & Gray
from the Pliocene of California, but differ from it in their more acute
periphery, the more inflated chambers and the different nature of the
ribs, which make a rotatory pattern on the surface. They show great
similarities in the test shape and chamber ornamentation to Spiroloculina
striatula Ten Dam & Reinhold from the Middle Miocene of Holland, but
differ from it in lacking an angular periphery and triple keel. Nevertheless,
the two species are closely related, the more so as single specimens
with only one keel have also been found in S. striatula. It seems that
Massilina sp. 1, described from the Lower Miocene of Westfalia (Indans
1962), corresponds morphologically to our specimens from the Tortonian.
Distribution. - Poland: Lower Tortonian (Karsy, Korytnica, Choment6w,
Grabki Duze. L~ki Dolne). GFR: Lower Miocene, Westfalia. Romania:
Lower Tortonian, Buitur.
Quinqueloculina bogdanowiczi (Serova, 1955)
(pI. V, Figs 3 a-c, 4 a-c; Text-fig. 10)
1955. Miliolina bogdanowiczi Serova; M. J. Serova, p. 309, PI. 4, Figs 1-3.
1961. Quinqueloculina bogdanowiczi (Serova); V. J. Didkovsky, p. 22, PI. 1, Fig. 4.
1961. Quinqueloculina brevia Didkovsky; ibidem, p. 45, PI. 9, Fig. 2.
Material. - About 200 QS and 20 MS (ColI. No. F-104, Sec. No. 126­
130, 306).
Dimensions: QS - L 0.65-1.20; B 0.5-0.85; T 0.35-0.65; MS - L 1.2:
B 1.1; T 0.5.