Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 62. (Budapest 1970)

Nagy, I. Z.: Lower Liassic molluscs from the Mts. Mecsek, Hungary

Examined material: Molds and fragments of four specimens, partly with shells. Mecsekszabolcs, J. Ferenc shaft, cover of bed 8. M 09.347. Remarks: The fragments represent comparatively large exemplars. The shells are rhomboid, with a straight ligamental margin, and an advanced, hardly protruding apex. The growth lines are rather strong. They cannot be identified with PETERS'S specimens, since they possess the anterior auricles. The forms published by FTJCINI represent shells with straightly truncate auricles posteriorly, but the characteristic sigmoidal growth lines are absent. Iso gnomon peters! (VADÁSZ) Pl. I, Figs. 4-6. 1862 Perna infraliasica (non QUENST.), PETERS, Lias von Fünfkirchen, p. 19, Pl. I, Figs. 4-6. Examined material: 25 molds, the shells more or less present. Localities: Hosszuhetény, shaft II; Pécsbányatelcp, András shaft, level VII, southern cross section 2, 2/3 bed; Somogy, Komló, Újakna. M 69.355; M 69.361. Remarks: PETERS identified the specimens with QUENSTEDT'S species cited above. He considered the lack of auricles an impaired state of preservation, but the forms from the Mts. Mecsek proved to represent a distinct species. The right shell is convex, with a robust keel decurrent from the apex and widening posteriorad, then it disappears. The lateral auricle is comparatively well developed, and also made distinct by a shallow depression. (Thus also diverging from QUENSTEDT'S species.) The posterior auricle passes into the convex shell without any distinct borders. The apex is slightly incurving. The left shell shows a similar shape but it is much flatter. A frequent species in the Liassic at the Mts. Mecsek. Isognomon cfr. petersi (VADÁSZ) Mold fragments, deriving from the Ferenc shaft and the Thommen shaft at Pécs, but not nearer identifiable owing to their had state of preservation. Suparfam. Pectinaeea; Fam.: Peetinidne LAMARCK, 1801; Genus: Entolium MEEK, 1869. Entolium cfr. proetus (D'ORBIGNY) 1926 Entolium proetus D'ORB. — STAESCIIE, Pectiniden, p. 96, PI. 6, Figs. 3-4. Examined material: A single specimen, partly with shell, from the shale dump at Fíosszúhetény, deriving from the hanging marl above the coal bed. M 69.352. Remarks: The apex and the auricles are unexaminable; the shell is higher than wide. By its habit, the specimen is assignable to the Formenkreis of the above species. Genus: Chlamys RÖDING, 1798.