Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 26. 2008. (Budapest, 2008)

carinae both on spiral and umbilical sides. Outer face strongly convex on last whorl but flattened on earlier ones. Peristome not preserved. Protoconch somewhat raised on spiral side; it consists of rounded nucleus and about one whorl. Angulations appear on first half of second whorl and carinae develop on third whorl. Sculpture — Carinae present on outer angulations of teleoconch except last whorl. Collabral ornament on spiral and umbilical side of whorls consists of marked, riblet-like, suture to suture growth-lines, corrugating carinae of angulations. Intermediate riblets, which do not reach outer angulation, may also appear on penultimate and last whorls. No ornament observable on earliest whorls (? because of preservation), but whole visible surface of postjuvenile whorls of lectotype covered by spiral threads, being more marked near carinae (or outer angulations) and on outer side. Remarks — It is remarkable, that the protoconch morphology is similar to that of Asterohelix but the spiral and umbilical sides are prominendy asymmetrical in this genus. The Úrkút (Bakony Mts) specimen has marked spiral lineation on longer shell part and in wider whorl surface belt than the Hierlatz and, especially, the Schafberg one. On the latter specimen, the practically total lack of lineation is caused probably by the much stronger re-crystallisation that frequently fades away delicate ornament from the shells. Discohelix reticulata belongs to the group of the sparsest species in the genus therefore has not yet been really well known, however, the morphology suggests belonging to Discohelix as an independent species. Most similar shells are those of juvenile Discohelix orbis or Discohelix ornata but the collabral riblets are more distinct and arched in Discohelix reticulata than in the other two species. Beside these, marked differences are in the ratio of whorl width to height. Distribution — Hallstatt, Hierlatz Alpe, Sinemurian (Oxynotum Zone); Schafberg (St. Wolfgang), Sinemurian; Úrkút (Bakony Mts), Lower (?) Sinemurian. Figure 12 — Discohelix reticulata STOLICZKA, 1861. 11 a-c: copy of original figures from STOLICZKA (1861) Tafel 111; A-D: the lectotype, xl; E-G: magnified views of the lectotype to show details of the ornament, x3; A, F = aperture view, B, E = spire side, C, G = umbilical side; D: dorsal side of the lectotype; H: paralectotype (NhM), x5. Genus Asterohelix SZABÓ, 1984 Type species: Discohelix spinicosta STOLICZKA, 1861. Diagnosis (emended) — Dextral, small, discoidal shell with feebly convex to feebly concave spire and wide umbilicus; depressed quadrangular whorl cross-sections with somewhat convex spiral and umbilical sides, outer face flat or feebly concave; carinae present on outer angulations of juvenile shell but may be lacking from last whorl, spiral side carina stronger than basal one; shell broadly phaneromphalous, umbilical wall gradate; trace on inner mould suggest outward tapering peristome; collabral ornament composed of growth-lines, "growth-riblets" and spiny ribs that may be "parabolic" in (nearly) adult growth phases; spines of latter ornamental elements corrugate carinae, followed by impressed suture that shows asterisk line on spiral side, at least in juvenile shell; dense nodules may develop along adaxial-abapical angulation of whorls on base and within umbilicus; ribs denser on umbilical side of whorls than on spire side; strongly flattened trochospiral protoconch seems smooth. Remarks — SZABÓ (1984) identified a gastropod specimen from the Bakony Mts as Discohelix spinicosta STOLICZKA, 1861 without possibility to compare it to the type material. This identification seemed correct because STOLICZKA's (1861) description and figures do not provide information about the trochospiral nature of the shell, and the last whorl that has morphology different from the previous ones in the syntypes (see below).