Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 73. (Budapest 1981)
Szabó, J.: Lower and Middle Jurassic Gastropods from the Bakony Mountains (Hungary). Part III.: Patellacea and Trochacea (Archaeogastropoda)
Remarks — A few species have such a deep umbilical region as the Trochopsis kondai sp. n., in other stratigraphical distribution, but no one has such an umbilicus, owing to this the generic position is somewhat uncertain. Distribution — Bakony Mts., Somhegy: ? Humphriesianum and Subfurcatum to Garantiana (condensed) Zone. Genus ADEORBISINA GRECO, 1899 Adeorbisina lateumbilicata (UHLIG, 1881) (Plate II: figs. 9-11) 1881 : Chrysostoma lateumbilicatum UHLIG, p. 402, pi. 8, fig. 3, 5. Measurements: H HL HA D W A Plate II: figs. 9-11 12 10.5 9 18 9 122° Material — Ten, more or less well preserved, shelly specimens. Shape — Dextral, lenticular, the spire is conical with slightly convex whorls. The periphery is angulate and carinate on the last half whorl. The characteristic deviation from the normal coiling on the last whorl of the genus appears here as breaking of the carina. The aperture is orbicular, surrounded by a weakly thickened peristome. The strongly convex base has a shajlow excavation medially, partially infilled by a callus. Ornament — The shell is smooth, with fine prosocline growth lines. Remarks — UHLIG'S description of the species was made from Upper Callovian specimens. In spite of the significant difference between the ages of the two material, the specimens from Somhegy do not differ remarkably from UHLIG'S figures. Distribution — W. Carpathians : Upper Callovian ; Bakony Mts*, Somhegy : condensed Subfurcatum to Garantiana Zone. Adeorbisina procera sp. n. (Plate II: figs. 12-13) Holotype : Plate II: figs. 12-13. — Locus typicus: Bakonybél, Somhegy—Stratum typicum : horizontal fissure-filling limestone —Derivatio nominis: procera (LAT.) <= high, prominent, thisspecies has the highest spire amongst the known species. — Diagnosis : high spire; strong, axially depressed expansion on the last whorl; The upper edge of the last whorl is bent upwards to the penultimate whorl. Measurements: H HL HA D W A Plate II: figs. 12-13 21 16.5 9 55-75° Material — Five, mostly damaged adult and two juvenile specimens. Shape — The shell is dextral, somewhat cyrtoconoid. The surface of the whorls is slightly convex, but on the last whorl there is a narrow concave band along the upper suture. The expansion of the last whorl is large and depressed axially. The normally coiled whorl portion following the expansion, ends in a slightly expanded peristome, which encloses an orbicular aperture. The base is convex, anomphalous, bearing a callus connected to the inner lip. Ornament — The shell is smooth with very fine, somewhat prosocline gtowth lines, being prosocyrt at the inner lip only. Remarks — It is a species with the highest spire amongst the known species. By this feature and by the last whorl having no spiral angulation or carina, the species is well distinguishable. Distribution — Bakony Mts., Somhegy : condensed Subfurcatum to Garanciana Zone. Genus ZIRC I A gen. n. Type species: Zircia zircensis sp. n. (see below) •— Derivatio nominis: after Zirc (a village near the locality). — Diagnosis: thick shell, with conical shape having a blunt apex; a keel immediately below the suture, resulting an extremely narrow ramp on its adapical side and a weak convexity below; rounded periphery; elliptical, prosocline peristome with a thick and large callus; ornament spiral grooves and lines on the base and below the carina. Remarks — Zircia gen. n. having a carina on the whorls differs from all of the genera of Ataphridae. By the deeper suture, the Trochopsidea is seen as its closest ally, but the building the peristome is unlike. However, the embryonal (juvenile) shell of the Zircia is like as that of Trochopsidea.
