Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 26. 2008. (Budapest, 2008)
Measurements H holotype *6.6 HI HPW *4.8 Shape — Dextral, discoidal form, with spire less concave than umbilicus. Protoconch slightly raised in beginning (nucleus and one whorl). Whorl surface convex on outer, but flat on spiral and umbilical sides. Angulations sharp and carinate on second and third whorls, but rounded and without keels on subsequent whorls. No modification found on preserved peristome fragments. Sculpture — No ornament visible on protoconch. Spiral sculpture appears only with magnification on outer side. It comprises random fragments of spiral threads. Spiral and umbilical sides covered by periodically appearing roof-tile-like, tiny collabral bars, which fade out on outer side immediately after angulations. Bars divided by extremely fine growth-lines. Somewhat stronger growthlines as only collabral ornament visible on outer side. D *14.6 *3. AS 235 c AU 131° Remarks — The best preserved specimen shows a peculiar sculpture under magnification. From periodically repeated, spot-like depressions along the suture, fine, prorsiradiate and virgatotom bundles of slightly opisthocyrt lines arise, which arrive to the outer angulations almost tangentially. The origin of these lines is unknown. Perhaps these are traces of a former organic outer layer and/or ornament. On the basis of angulations without carinae after the earliest teleoconch whorls D. acarinata is distinguishable from the similarly sized, juvenile D. miocarinata and D. excavata specimens, having yet carinae in that growth stages. Their adult specimens are much larger and have markedly different ornament on the last whorl. D. inornata has also shells without keels but differs in its sculpture and dimensions. Figure 11 — Discohelix acarinata SZABÓ, 1979; refiguration of the holotype. — A-C: spiral, "apertural" and umbilical view, xl; D—E: magnified view of the spiral and the somewhat deeper umbilical side to show the ornament ( x 4). The similarly shaped forms figured by G. G. GEMMELLARO (1874) as D. excavata do not belong to D. acarinata (neither to D. excavata). Though the carinae are lacking, the characteristic bars of the sculpture are present and the dimensions are not too different, the Sicily specimens have different dimensions and spiral lineation on the juvenile whorls (pers. obs.) therefore their belonging to another (new) species is rather likely. Distribution — Lókút, Kericser (Bakony Mts), beds with mixed Obtusum to Ibex fauna and Davoei Zone; Közöskúti-árok, Ibex Zone and a bed with mixed Ibex Zone and Lower Toarcian fauna (Bakony Mts). Discohelix reticulata STOLICZKA, 1861 (Figure 12) 1861: Discohelix reticulata STOL. — STOLICZKA, p. 183, pi. 3, fig. 11. 2003: Discohelix reticulata STOLICZKA, 1861 — SZABÓ in: VÖRÖS et. al, p. 64, pl. V: 25. Lectotype — GBa 2008/69/33/1; paralectotype: NhM 1861/0034/0026. Material — Three specimens, one in the GBa (seems adult), selected as lectotype, showing also parts of the umbilical side; another in NhM (subadult, only spire side visible); third one from Úrkút (recently collected, HNHM). Measurements H HI HPW D W AS AU lectotype 2.3 13.2 3 195° **~160° paralectotype *10.1 *1.8 190° **~165° Shape — Flattened (coin-shaped), dextrally coiled shell of feebly concave, almost plane spiral and weakly concave umbilical side. Whorls axially flattened, much wider than high. Angulations distinct on teleoconch, and carinate between protoconch and end of penultimate whorl; feebly concave belt of whorl surface accompany
