Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 75. (Budapest 1983)
Szabó, J.: Lower and Middle Jurassic Gastropods from the Bakony Mountains (Hungary). Part V.: Supplement to Archaeogastropoda; Caenogastropoda
proportions are also markedly different. However, it should be mentioned that both species belong to the rare forms in tha Alps as well as in the Bakony Mts., so they are imperfectly known. Anoptychia hastata sp. n. (Plate II: figs 5-6) H o 1 o t y p H s : Plate II : figs 5-6. — Locus typicus: Bakonybél, Somhegy. — Stratum typicum: limestone infilling horizontal fissure. — Derivation no minis: hasta (Lat.) = spear. Diagnosis : very high spire, great number of whorls, flattened whorl-surface; riblets on the juvenile whorls near the apex; spiral threads on the whole shell, with slightly weaker intersecting growth lines on the whorls. Measurements: H HL HA D W A Plate II: figs 5-6. — 15.5 10 10.5 5 9 Q Material — Two fragmentary specimens, one of these is partially an impression. Shape — Dextral shell with very high spire. The surface of the whorls is flat, with hardly impressed suture, which is similar in strength to the small grooves between the spiral threads. The periphery is rounded, the base is convex, without umbilicus. Entire peristome cannot be studied on either specimens, but it may be similar in shape to the parallelogram-formed whorl-section. The outer lip was probably slightly opisthicyrt like the growth lines. Only the columellar portion of the inner lip is visible, which is straight without thickening, and its abaxial end curves into the basal lip without siphonal canal or its rudiment. Ornament — Except the subsutural narrow zone, the whole shell is ornamented with spiral threads, which widen on the last whorl and on the base, and the narrow grooves between them become rather characteristic. The juvenile transverse sculpture — on the basis of a single impression — consists of small opisthocline ribs. These fade out later, first on the mid-whorls, then on below and above the suture. The growth lines are also opisthocline initially, becoming opisthocyrt later. Among them, especially on the younger whorls, there are almost periodically repeating growth lines of nearly as strong as threads. Distribution — Bakonybél. Somhegy : condensed Subfurcatum and Garantiana Zones. Remarks — The contemporary families are comprised of several known or imperfectly known high-spired genera, e. g. Rhahdochonca (Pseudomelaniidae), Climacina (Spirostylidae) with non-ribbed juvenile shell, and Laevibacidis with additional lack of spiral ornament. This latter genus is ranged among that family (Procerithiidae), which hosts Cosmocerithium, that may have similar ornament but this shows rudimentary siphonal canal on the peristome. The here described from — judging from irs preserved peristome fragment — does not'show even a trace of this element. A. hastata sp. n. can be easily distinguished from the similarly-built Nerineacea genera by the smooth internal wall and columellar surfaces. Species of Anoptychia with similarly high spire cannot be found in the literature. Superfamily Pseudomelaniacea FISCHER, 1885 Family Pseudomelaniidae FISCHER. 1885 Genus PSEVDOMELANIA PICTET et CAMPICHE. 1862 Pseudomelania? sp. (Plate III: fig. 10) Measurements: H HL HA D W A Plate III: fig. 10. — 11 6 6.5 3 13 E Material — A single fragmentary specimen with shell. Shape— Dextral shell with high spire, hardly convex whorl-surfaces and suture as a narrow groove. The aperture is elongated axially. sharpening at the suture, and the columellar lip is somewhat thickened. Anomphalous. the outline of the base is slightly concave. Ornament — The shell is ornamented only with prosocline and slightly opisthocyrt growth lines. Distribution — Bakonybél. Somhegy: ?Bajocian ( ?Humphriesianum Zone).
