Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 15. 1992. (Budapest, 1992)

the total thickness. The width of plica is greater than half of the total width. The shallow fold develops gradually at half length on the pedicle valve while on the brachial valve it is observed anteriorly only. The fold edges are quite rounded. There are some growth lines on the surface of shell. Internal characters: There were no adequate specimens available for serial sectioning due to the paucity of the material. Remarks: The distinction from Liospiriferina obtusa seems to be reasonable on the basis of outline, the size of beak, the angle between the lateral margins and the relative position of the two umbones. For a more precise identification and description more and better preserved specimens would be needed. The specimens illustrated by Parona (1893) and Sacchi Vialli and Cantaluppi (1967) are in good agreement with our form. Distribution: Similar forms were described only from the Southern Alps (Piemonte region). Liospiriferina angulata (OPPEL, 1861) (Pl. III, Fig. 1; Text-fig. 16) 1861 Spiriferina angulata n.sp. - Oppel: p. 541, pi. 11, fig. 7. 1878 Spiriferina angulata OPPEL - Gemmellaro: p. 412, pi. 31, figs. 41-46. 1879 Spiriferina cf. angulata OPPEL - Uhlig: p. 14, pl. 1, fig. 4. 1889 Spiriferina angulata OPPEL - Geyer: p. 74, pi. 9, figs. 7-12. 1893 Spiriferina angulata OPPEL - Parona: p. 25, pl. 1, fig. 13. 1907 Spiriferina angulata OPPEL - Dal Piaz: p. 5, pl. 1, fig. 1. 1930 Spiriferina angulata OPPEL - De Gregorio: p. 43, pi. 12, fig. 6. 1937 Spiriferina angulata OPPEL - Ormós: p. 18, pl. 1, fig. 3. 1964 Spiriferina angulata OPPEL - Sacchi Vialli: p. 88, pi. 13, fig. 7. non 1861 Spiriferina (cf. angulata) obtusa n.sp. - Oppel: p. 542, pi. 11, fig. 8. non 1874 Spiriferina cf. angulata OPPEL - Gemmellaro: p. 56, pi. 10, figs. 6-7. non 1895 Spiriferina angulata OPPEL - Fucini: p. 148, pi. 6, fig. 7. non 1900 Spiriferina cf. angulata OPPEL - Böse and Schlosser: p. 199, pi. 18, figs. 20., 23., 25. Material: 19 pedicle valves. Dimensions (mm): Specimen M.91.15. (Text-fig. 16) length: 12.0, width: 14.4, thickness: 9.2. Description - External characters: Small to medium-sized shell, triangular in outline. The width of pedicle valve is slightly greater than its length. The thickness is smaller than the other two values. The angle between the lateral margins is about 80°. The pedicle valve is convex with a prominent umbo. The beak is large and straight. The ventral interarea is equilateral, triangular in outline, plain or slightly concave. There are Text-fig. 16 - Drawing of Liospiriferina angulata