Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 74. (Budapest 1982)

Szabó, J.: Lower and Middle Jurassic Gastropods from the Bakony Mountains (Hungary). Part IV.: Neritacea, Craspedostomatacea, Amberleyacea (Archaeogastropoda)

Eucyclomphalus sp. (Plate III: fig. 10) Measurements: H HL HA D W A Plate III: fig. 10 21 13 9 14 9 55° Material : Two bad preserved, shelly specimens. Shape : Dextral, littoriniform, with convex surface of the whorls and the narrowly phaneromphalous base. The suture is situated in a moderately deep furrow. The umbilical lip is straight and vertical, the cross-section of the whorls is subcircular on the part corresponding to the outer lip. Ornament : The whorls and the base are sculptured by spiral cords, on the latter in double density. Very fine, prosocline growth-lines and fine threads give the transversal ornament. It cannot be seen, whether or not tubercles are sitting on the crossing points of the cords and the threads. Distribution : Bakony Mts., Kericser: beds with mixed Obtusum to Ibex Zone fauna and Davoei Zone. Remarks : On the basis of the greater spiral angle and the narrower umbilicus, this species is distinctly separable from the Eucyclomphalus aff. campiliensis DE STEF., but owing to the bad state of preservation, it is undeterminable. Definitely, this species belongs to the relatives of "Turbo" elegáns MÜNSTER, 1844 and "Turbo" ferryi DUMORTIER, 1864 but there are disagreements in the number and nature of the cords, and the measurements. Family? Nododelphinulidae Cox, 1960 Genus? TROCHACANTHUS DACQUÉ, 1936 Trochacanthus ? disputabilis (UHLIG, 1881) (Plate III: figs. 11-12) 1881 : Trochus disputabilis UHLIG, p. 406, pl. VIII, fig. 7-8. Measurements: H HL HA W D A Plate III: figs. 11-12 15 - 9 32° Material : Two, fragmentary, shelly specimens. Shape : Dextral, moderately high conical-trochiform, with a rather deep suture and convex whorls. On the last whorl, two rounded angulations are present, each of them marked by a nodosed carina. The upper one corresponds to the periphery, and its nodulae are sparser and greater than of the lower carina. This latter is the outer border of the flattened convex, anomphalous base and it is just exposed above the suture on the whorls. The peristome seems to be rather prosocline, with a parietal callosity. Ornament : The whorls are covered by longitudinal and transversal cords yielding a retiform sculpture, the latter are less prosocline above the periphery and rather below it. On the base only the spiral cords are present. Distribution: Western Carpathians, Babierzóvka: Upper Callovian; Bakony Mts., Somhegy: condensed Subfurcatum to Garantiana Zone. Remarks : The determination was easy on species level, but remained "disputabilis" on generic leves. Trochacanthus was the only genus, on which I can see a similar type of nodosity besides the comparable shape. The nodulae of the peripherial carina remind me the parabolic type, but they may be a row of tremata. The clearing up of this question needs specimens in better state of preservation than the available ones. References BOURROUILH, L. (1966): Gastéropodes du Lias inférieur et moyen du atlasique marocain. — Notes Mém. Serv. Mines Carte géol. Maroc, 196: 25-72. pis 1-3. BÖCKH J. (1874): Die geologischen Verhältnisse des südlichen Theiles des Bakonys, II. Theil. — Mitt. Jb. K. ung. geol. Abst., 3: 1-180. pis. 1-7. BRÖSAMLEN, R. (1909): Beitrag zur Kentniss der Gastropoden des schawäbischen Jura. — Palaecntcgraphica. 56: 177-321, pis 17-22. COSSMANN, M. (1916): Essais de Paléoconchologie comparée. — Paris. 10, 292 pp.. 12 pis.