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)
suture on the earlier whorls. The base is convex and anomphalous. The rounded, axially somewhat elongated aperture is enclosed by a thickened peristome. Its outer lip bears an outer varix yet the inner lip a weaker inner thickening, which is a part of the columella. A groove separates the inner lip from the base. The outer varices are regularly repeated on each of the whorls. Ornament — Some obscure spiral lines are only as spiral ornament besides the above mentioned two carinae. The upper one of these is dissected by short spines at the points of crossing with the varices. On the earlier volutions, the spines are elongated transversely, but do not reach the sutures, however on the last two or three whorls shallow, broad ridges run from sutur to suture and as weak undulations, these latter continues on the base. The growth lines are variously prosocline. A parabolic line borders each of the varices, pointing to the spines. The parts are the most prosocline above the upper carina and the least prosocline below it. Between two spines, the growth lines enclose an angle with the earlier parabolic line, then become more and more similar to the next parabolic line. Remarks — The specimens are well identifiable with UHLIG'S description. On the basis of specimens with peristome, it is sure that the species does not belong to the genus Brachytrema, but owing to a shallow sinus of the basal lip, somewhat referable to the order Caenogastropoda. Distribution —• West Carpathians, Babierzowka : Callovian ; Bakony Mts., Somhegy : Humphriesianum to Parkinsoni Zone. Subfamily Colloniinae COSSMANN, 1916 Genus Bakonyia gen. n. Type species: Bakonyia planapex sp. n. — Derivatio nominis: from the Bakony Mountains — Diagnosis: subglobose, thick shell with convex whorls and planispiral protoconch ; convex, broadly phaneromphalous base; the aperture orbicular with peristome lying nearly in one plane, its suturai part is somewhat thickened ; at its lower part the umbilical lip bears a strong inner protrusion, which is the end of a strong, beaded or rather transversely ribbed carina encircling the umbilicus; the carina, at least its peristomal end, is covering a narrow, longitudinal, inner channel; smooth shell with fine growth lines, which are feebly prosocline on the whorls and opisthocline on the base. Remarks — It is a special, perhaps an endemic form. Bakonyia gen. n. is somewhat similar to Collonia GRAY, 1850, perhaps by homeomorphism but differs from it in the protoconch, the broader umbilicus surrounding much stronger, ribbed (not granular) carina and the not thickened outer lip. Bakonyia planapex sp. n. (Plate II: figs. 5-8) Holotype : plate II: figs. 5-6. — Locus typicus: Bakonybél, Somhegy — Stratum typicum: horizontal fissure —filling limestone —Derivatio nominis: planapex = reference to the planispiral protoconch —-Diagnosis : see above, at the Bakonyia gen. n. Measurements: H HL HA D W A Plate II: figs. 5-6 10 9 6.5 12 6.3 125° Material — Ten, more or less well-preserved specimens. Shape and ornament — See above at the diagnosis of Bakonyia Embryonal shape and ornament — The nucleus and the first whorl are sunk into the plain of the second whorl, thus resulting in a blunt apex. A keel appears on the midwhorl shortly behinde the nucleus. It is seen along one-and-a-quarter whorls, than it becomes flat, but as a weak undulation it may appear near the suture to the adult peristome. Remarks — Some of the specimens show obscure spiral lines, mainly at the suture. Distribution — Bakony Mts., Somhegy : Subfurcatum to Garantiana Zone (condensed). Family Ataphridae COSSMANN, 1918 Genus ATAPHRUS G ABB, 1869 Ataphrus folcoi (M. GEMMELLARO, 1911) (Plate II: fig. 14) 1911 : Trochus Folcoi M. GEMMELLARO, p. 2,25 pi. 9, fig. 33-34. (?) Chrysostoma Sequenzai M. GEMMELLARO, p. 232, pi. 9, fig. 29-32. Measurements: H HL HA D W A Plate II: fig. 14 9.5 7 4.8 8.5 4 —
