Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 15. 1992. (Budapest, 1992)
Internal characters: There were no adequate specimens available for serial sectioning due to the paucity of the material. Remarks: The outline of shell is subject of significant variability (subtriangular to subpentagonal, the anterior margin is straight or concave). The rib pattern is also variable. According to Oppel's (1861) first description, the costae are quite weak at the umbones. However, Geyer (1889) identified some specimens as Rhynchonella retusifrons with costae running from the umbo straight to the anterior end (pl.7, fig. 10, 12). The two stronger costae are absent on Haas' (1884) and Rau's (1905) figures, therefore their determinations are uncertain. R. cartieriformis described by Vígh (1943) is considered synonymous with Cuneirhynchia? retusifrons. It should be mentioned that already Oppel (1861) considered close relationship between R. cartieri and R. retusifrons. Distribution: According to Almeras (1964), C? retusifrons is Hettangian to Middle Sinemurian in age. Its occurrence in the Pliensbachian is uncertain. Beside the Bakony Mountains, this species is known from the Eastern Alps (Hierlatz), the Southern Alps (South Tyrol, Venetian Alps), Sicily (Trapani), the Tell Atlas and the Gerecse Mountains. Cuneirhynchia? cartieri (OPPEL, 1861) (Pl. II, Figs. 1-2; Text-figs. 11-12) 1861 Rhynchonella Cartieri n.sp. - Oppel: p. 545. 1878 Rhynchonella caroli n.sp. - Gemmellaro: p. 423, pi. 31, figs. 79-87. 1889 Rhynchonella Cartieri OPPEL - Geyer: p. 63, pi. 7, figs. 13-14. 1895 Rhynchonella caroli GEMMELLARO - Fucini: p. 168, pi. 7, fig. 4. 1926 Rhynchonella cartieri OPPEL - Peterhans: p. 363, pi. 2, figs .1-4. 1943 Rhynchonella cartieri OPPEL - Vígh: p. 45, pi. 2, figs. 25-27, pi. 3, figs. 1-5. 1953 Rhynchonella cartieri OPPEL - Rossi Ronchetti and Brena: p. 120, pi. 10, fig. 8. Material: 45 complete specimens. Dimensions (mm): Specimen M.91.11. (Text-fig. 11) length: 11.6, width: 11.9, thickness: 9.8. Description - External characters: There are two varieties of C? cartieri in the material of Lókút Hill. The two varieties probably represent two different subspecies and they occur separately from one another in the stratigraphie section. The differences of the two subspecies are ecologically controlled. The form which occurs in the lower part of the section is small, roundish in outline, glo- ^ xt " fig ' 11 7 Drawin ê of bose or nearly sphaerical. The angle between Cuneirhynchia ? cartieri the lateral margins is about 115°. The length and the width are nearly equal and the thickness is slightly smaller. Biconvex form, the brachial valve is more convex than the pedicle one. The maximum width and the maximum convexity is situated
