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 — Eight f two(?) shelly, more or less fragmentary specimens. Shape — Dextral, low turbiniform species having convex whorls and base. The shell is bending upwards toward the former whorl as a narrow band. The aperture is almost orbicular. The columellar lip is thickened, bearing a shallow furrow in its middle, that is ending at a tubercle on the basal lip. This tubercle continues on the base as a weak swelling. The shell is probably cryptomphalous. Ornament — Above the prosocline growth lines, several weak spiral lines of the basal swelling give the ornament. Remarks — In the available, relatively small material, the two "species" mentioned in the synonymy are observed, besides them more depressed specimens with deeper sutures are also occurred. This suggests, that the specimens belong to a single but variable species. Distribution — Sicily, Galati: "Terlbratula Aspasia" Zone; Bakony Mts., Sümeg: ? Upper Sinemurian; Kericser: beds with mixed Obtusum to Ibex Zone fauna. Genus TROCHOPSIDEA WENZ, 1938 Trochopsidea latilabra (STOLICZKA, 1861) (Plate II: figs. 15-16) 1861 : Trochus latilabrus STOLICZKA, p. 173, pl. II, fig. 9. 1876: Turbo latilabrus TATE, p. 343, pl. IX, fig. 15. Measurements: H HL HA D W A Plate II: figs. 15-16 16 11.5 20 11.7 109° Material — One specimen with good preservation and three fragments. Shape — Dextral, with convex surface of the whorls and base. The shell is bending up along the suture. The rounded, prosocline peristome is depressed axially. Its columellar lip is thick, but it is damaged, so the generic marks are not seen, STOLICZKA'S description has given information in order to make decision in this question. The species has no umbilicus. Ornament — It consists of fine growth lines and even finer spiral lines, the latter are seen under magnification only. The growth lines are more prosocline on the whorls and less so on the base. Along the suture and the inner lip they become prosocyrt in a narrow band. Remarks — TATE'S T. latilabrus STOL. differs from the others in its feebly cyrtoconoid outline. Practically, there are no difference between the measurable specimen from the Bakony Mts. and STOLICZKA'S figure. The counted ratios agree up to the first decimal. Distribution — Northern Alps: Hierlatz Limestone; SW England Spinatum Zone; Bakony Mts., Kericser: Stokesi Zone; Eplény: Domerian. Trochopsidea kondai sp. n. (Plate II: figs. 17-18) Holotype : Plate II

: figs. 17-18 — Locus typicus: Bakonybél, Somhegy—Stratum typicum: horizontal fissure

—filling limestone

—Derivatio nominis: the name is given after DR. J. KONDA, who collected the majority of the available material, including the holotype. — Diagnosis : heliciform, smooth shell with moderately convex surface of the whorls and the base; the latter having a medial depression with a narrow umbilicus, hidden by a callus. Measurements: H HL HA D W A Plate II: figs. 17-18. 10 8.5 5 9.5 5 85-125° Material — It is represented by thirty specimens. Shape — Dextral, heliciform with a somewhat convex outline. The whorls are slightly convex, but along the suture, there is a narrow concave band where it bends upwards to the former whorl. The peristome is orbicular, with a callus on the inner lip, bearing moreover an inner thickening parallel to its outer face. The thickening starts on the outer lip and ends on the basal lip. A groove runs between the outer border of the columellar lip and the thickening. The relatively large callus covers the umbilicus (except a narrow slit) and a part of the base on the parietal region. Ornament — The obscure growth lines seen in magnification, are weakly prosocline, but opisthocyrt on the callus. Embryonal shape and ornament — Similar to the adult shell, but the shape is more depressed and lacks the concavity along the suture. The nucleus raises from the first whorl a little. The possible end of the embryonal shell is at the beginning of the mentioned concavity on the third whorl.