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

present in Ventricaria. Probably congeneric with the here described V.? vesicula sp. n. is the similarly-shaped and also thin-shelled Onkospira pupaefornu's VACEK, 1886, which, in turn, is clearly distinguished by its higher spire and more numerous whorls. Order CAENOGASTROPODA Cox. 1959 Superfamily Loxonematacea KOKEN, 1889 Family Zygopleuridae WENZ, 1938 Genus KATOSIRA KOKEN. 1892 Katosira undulata (BENZ, 1832) (Plate II: figs 1-2) 1832: Turritella undulata BENZ — in: ZIETEN, p. 43, pi. 32, fig. 2. 1852: Chemnitzia undulata D'ORBIGNY, p. 35, pi. 237, fig. 16. 1858: Turritella undulata ZIET. — QUENSTEDT, p. 153. pi. 19. fig. 13. 1861: Chemnitzia undulata BENZ. — STOLICZKA, p. 163, pl. 1, fig. 1. 71869: Chemnitzia undulata (ZIETEN) — DUMORTIER, p. 101, pi. 18, fig. 8. 1884: Turritella undulata ZIET. — QUENSTEDT. p. 305, pi. 196. figs. 45-51. 1909: Katosira undulata BENZ — BRÖSAMLEN, p. 286, pl. 21, fig. 28. Measurements: H HL HA D W A Plate II: figs. 1-2. — 35 22.5 — — 17.5° Material — 9 + 72 fragmentary specimens with preserved shell or as internal moulds. Shape — The shell is dextral with high spire and convex whorl surfaces. Angulation is hardly visible in the periphery, it is accentuated rather by the carina. The parietal and columellar lips are covered by a thin callus. Ornament — The whorl surfaces and the base is divided by deep spiral grooves. These are intersected by opisthocyrt growth lines and strong, paralell folds on the whorls. The number of folds increases on the successive whorls during the growth, and run suture to suture or to the carina bordering the base on the last whorl. The growth lines are orthocline on the base. Distribution — South Germany: Pliensbachian; France, Normandy: Middle Liassic; Northern Calcareous Alps: Hierlatz limestone; Bakony, Kericser Ibex, ?Davoei and Stokesi Zones, Hamuháza: Davoei Zone, Lókút: ?Davoei Zone. Remarks — This form is easily distinguished by its convex whorl surface and greater spiral angle from Katosira periniana (D'ORBIGNY, 1853), a species with almost totally flat whorls except the convexly-whorled juvenile shell. In this latter species it is not the folds that emerge from the conical surface formed by the sutures, but actually the furrows between them are depressed. On the basis of the these diiferences, the uniting of the two forms (STOLICZKA, 1861) seems unjustified. The fragment determined by Dumortier (1869) as Chemnitzia undulata (ZIETEN) seems different, even generically, on the basis of its substantially different proportions and the almost total lack of transverse folds. Katosira periniana (D'ORBIGNY. 1853) (Plate II: fig. 3) 1853: Chemnitzia periniana D'ORBIGNY p. 36, pi. 243, figs 1-2. 71861 : Chemnitzia undulata BENZ — STOLICZKA, p. 163, pi. 1. fig. 1. Measurements: H HL HA D W A Plate II: fig. 3. — 17.5 — 11 — 12.5° Material — Two fragmentary specimens with preserved shell. Shape — The shell is dextral with turriculate spire. The surface in the juvenile whorls strongly, in the later whorls slightly convex. A pronounced keel runs on the basal margin, while the base is conical with a somewhat concave outline on the part inclining to the columella.