Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 73. (Budapest 1981)

Szabó, J.: Lower and Middle Jurassic Gastropods from the Bakony Mountains (Hungary). Part III.: Patellacea and Trochacea (Archaeogastropoda)

Material — Two fragmentary specimens, completing each other with some overlapping. Shape — It is a dextral, very high trochiform species. The last whorl bicarinate, the other whorls are unicarinate, bacause the lower one is overlapped by the suture. The surface of the whorls consists of two flattened bands meeting at the upper keel. The lower, narrower band develops just on the juvenile whorls; the lower half of the upper band becomes concave on the last whorl. The base is convex, anomphalous. The peristome is preserved only partially, it has a parietal callus and a columellar inner swelling. Ornament — Close to the upper suture, a beaded longitudinal cord is running, its tubercles are elongated parallel to the growth lines. On the surface of the whorls, obscure spiral lines and on the whole base spiral cords are observed. On the keel of the volutions, stronger nodes are seen, beginning at the embryonal shell. These are lengthened later transversely like costae almost to the upper row of tubercles. Their highest points are placed on the carina. During growth, the tubercles are restricted to the carina, as weak undulations, then from the penultimate whorl, they reappear, but remain weaker than on the juvenile whorls and connected to the the upper tubercles by gradually lengthened and strengthened ribs on the last whorl. Embryonal shape and ornament — It is visible from the fragmentary embryonal shell, that its shape is cyrtoconical and the carina with the nodes appears on this part. Remarks — This species is distinguishable from D. unicarinatus sp. n. by the number of keels, the differences in the nodosities and the basal shape and ornament. DUBAR'S (1948) species Proconulus sp. A. has a shape and an ornament similar to D. bicarinatus sp. n., but its nodes are stronger and sparser, than on the latter, moreover being present over the full length of the shell. Distribution — Bakony Mts.

: Somhegy, condensed Subfurcatum to Garantiana Zone Genus ANTICONULVS COSSMANN, 1918 Anticonulus lateumbilicatus (D'ORBIGNY, 1852) (Plate I: fig. 22) 1852: Trochus lateumbilicatus D'ORBIGNY, p. 249, pi. 306, figs. 1-4. 1861: Trochus lateumbilicatus, STOLICZKA, p. 169, pl. 1, fig. 13. Measurements: H HL HA D W A Plate I: fig. 22 6.5 4.5 11 4.4 50-80° Material — Twenty-eight specimens mainly in good state of preservation. Shape — The shell is dextral, cyrtoconoid with acute apex. The surface of the whorls are slightly convex. The periphery is sharply angulate and a convex, broadly phaneromphalous base is seen below it. The aperture is probably quadral, but it is unobservable, owing to the extremely thin, fragile shell. Ornament — It consists of fine growth lines, which are prosocline on the whorls and opisthocline

—opishtocyrt on the base. Remarks — The forms from the Bakony Mts. and the Northern Alps are close to each other and differ from D'ORBIGNY'S figures in the acute apex and larger dimensions. Distribution — France, Middle Liassic; North-eastern Alps: Hierlatz Limestone; Bakony Mts., Sümeg: ? Upper Sinemurian, Szentgál: Raricostatum Zone, Kericser: beds with mixed fauna (Obtusum to Ibex Zone) and Ibex Zone. Family Turbinidae RAFINESQUE, 1815 Subfamily Liotiinae ADAMS & ADAMS, 1854 Genus EUCYCLOSCALA COSSMANN, 1895 Eucycloscala acanticum (UHLIG, 1881) (Plate II: figs. 3-4) 1881: (?) Brachytrema acanthicum UHLIG, p. 393, pl. IX, figs. 3 a, b Measurements: H HL HA D W A Plate II: fig. 3 15.5 9 6 10 62° Material — Fifteen, mostly fragmentary specimens. Shape — Dextral, with high conical, pagodiform spire. The whorls are convex, angulate, the last one is bicarinate; the upper keel is on the angulation, the lower keel is overlapped by the