Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 20. 2002. (Budapest, 2002)

Valamidiscus, a new Mesozoic gastropod 63 and position of a selenizone. These characters suggest that the COX, 1956. However, the poor state of preservation permits specimen most probably belongs to the genus Batbrotomaria to apply this name in doubtful form. Superfamily Trochoidea RAFINESQUE, 1815 Family Trochidae RAFINESQUE, 1815 Subfamily? Proconulinae COX, 1960 IProconulus scherinus (G. G. GEMMELLARO, 1874) (Plate I: 8) 1915: Trocbus epulus ORB. — VADÁSZ, p. 237. Material — Two fragmentary steinkerns. Measurements H HL HP D WP AA AL AUA AUL Plate I: 8 *6.5 *3.5 10 *48° 26° Remarks — The specimens have slightly cyrtoconical outline therefore they resemble to "Trocbus" actaeon D'ORBIGNY, 1853 but differ in having narrower spiral angles, higher, and consequently, fewer whorls. Trocbus epulus D'ORBIGNY, 1853 has a simple conical shell therefore VADÁSZ'S identification is erroneous. Though some authors uriify the two species but in this case the applicable name is actaeon (see FISCHER & WEBER 1997). The srjecimens lack the apical part and the shell that are needed to reliable genus and species identification. The earliest whorls indicate normal conical or acute juvenile shell like in the Middle Liassic Proconulus scherinus (G. G. GEMMELLARO, 1874) that is a species most resembling in its shape and dimensions. Superfamily Eucycloidea KOKEN, 1897 Family Eucyclidae KOKEN, 1897 Eucyclus} sp. (Plate I: 7) ? 1908: Pleurotomaria reticulata SOW. — 1908, p. 287, pl. VI: 8. ? 1908: Pleurotomaria cfr. sulcata Sow. — 1908, p. 287, pl. VI: 9. Material — Single fragmentary steinken. Measurements H HL HP D WP AA AL AUA AUL Plate I: 7 *21.5 *63° 63° Remarks — The specimen is an inner cast with a turbiniform shape, characteristic to the anomphalous shells of Eucyclus J. A. EUDES-DESLONGGHAMPS, 1860. There are two angulations on the whorls; the upper one corresponds to the periphery, the lower one is followed by the suture. No trace of other spiral ornamental elements is observable that is unusual in Eucyclus and in the other members of Eucyclidae. Commonly there are also other cords and carinae that are reflected on the inner casts (see e.g. Riselhidea below). In lack of these morphological characters, there is no reliable tool to distinguish the inner mould from that of some extreme species of Batbrotomaria, Pleurotomaria DEFRANCE, 1826 and Worthenia DEKONLNCK, 1883, which may possess an upper angulation, that have become the periphery. From these possibilities, the name Eucyclus has been selected because earlier investigations confirmed that this genus is charaaeristic in the depositional environment of the Rosso Ammonitico limestones (SZABÓ, 1995). The specimen is probably consrjedfic with those ones that have been named by VADÁSZ (1908) as Pleurotomaria reticulata SOW. and Pleurotomaria cfr. sulcata SOW. All these srx^dmens seem to belong to a single species that is rather variable in its spiral angle and the related dimensions. Because no resembling species has been found they may represent a new one. However, the steinkern preservation does not provide satisfactory conditions to establish new species. Riselhidea aff. noszkyi SZABÓ, 1995 (Plate I: 9) Material — Four fragmentary inner casts. Measurements H HL HP D WP AA AL AUA AUL Plate I: 9 *12 *7 *18 75° 75° -