Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 14. 1989. (Budapest, 1989)
them is bifurcate between an inner and two outer tubercles. Some others disappear around the halfway between the two sutures, they are in pairs of opposite direction but they do not meet each-other. A weak spiral lineation is observable only on the outer face of the penultimate whorl of the specimen. Remarks : The shape of the shell and the characters of the transversal ornament are the same as in D. dictyota. Most important feature in common is the weak, corrugated, spiral elevation along the inner suture. This kind of ornament is not frequent in Discohelix. The only significant difference is that D. dictyota has a spiral lineation not only on the outer (dorsal) surface (like VACEK's specimen), but also on the spiral and umbilical sides at the same ontogenetic stage. In this regard the specimen is similar to STOLICZKA's D. reticu lata but the dimensions are significantly different: the width of the whorls is bigger than the height in D. reticulata, while this ratio is just reversed in our case; the spiral elevation along the inner suture is present only on VACEK's specimen. We use the open name "D. aff. dictyota " in spite of the mentioned few differences which do not bear too much significance in some other groups. Eg. in Proconulus (see CONTI and SZABÓ 1987) a great variety from presence to absence, different length, position and density of spiral lineation occur even in one species. This time, we have not yet had enough data to estimate the real taxonomic value of this feature in Discohelix species. Superfamily Pleurotomariacea Swainson, 1840 Family P LEU ROTO MARIID AE Swainson, 1840 Genus Bathrotomaria Cox, 1956 Bathrotomaria submandokii sp. n. Plate I: 3-6. 1866. Pleurotomaria subreticulata Münster - VACEK, S. 106, Taf. XVIII, Fig. 3. Holotype : 1886/5/57 - Name : morphologically close to the Bajocian species Bathrotomaria mandokii Szabó, 1980 - Type locality : Cape San Vigilio - Type strata: San Vigilio Oolite Formation - Diagnosis : low conical shell with rounded angulation on whorls; selenizone just below angulation; outer face slightly concave on juvenile, flattened on last whorls; hardly convex, broadly phaneromphalous base; retiform ornament of collabral and spiral cords. Material: a single specimen (1886/5/57). Measurements ; H HL HA D W A 18 12 8 22 8.5 85° Descrip tion : The shell is medium-sized, broadly conical. The angulation of the whorls is less definite in juvenile part but the last two whorls are gradate. The rather wide selenizone (roughly a sixth of distance between two sutures) runs just below the rounded angulation. The ramp is somewhat narrower than the outer face. They, and the selenizone are flattened on the adult shell portions, but the outer face is slightly concave on juvenile whorls. The wide, a little convex base is delimited by a rounded-angular periphery externally, but it gradually inclines into a broadly opened umbilicus internally. The embryonal shell and the peristome are not preserved. Equally strong spiral and collabral cords compose the retiform ornament on the whorls and on the base. The interspaces of their pairs are different above and below the selenizone. Both the spiral and transverse elements are sparser on the ramp. The growth-lines are prosocline-slightly prosocyrt on the ramp, opisthocline on the outer face, and reversed S-shape lines are reflected on the basal part of the inner mould. Remarks : MÜNSTER's species Pleurotomaria subdec orata differs from the San Vigilio specimen in the position of the selenizone and in the ornament. Its selenizone runs in the middle of the outer face, which is really a Pleurotomaria character. Beside this, its collabral ornament is subordinate to spiral cords and the periphery is subnodose. D'ORBIGNY's
