Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 19. 2001. (Budapest, 2001)

pitals, 2 compound bones, 1 quadrate, 27 vertebrae (HNHM. No. V.99.36). Description and comments — From the remains, the supraoccipital (Figure 7: A), the compound bones (Figure 7: E) and the quadrate resemble homologous bones of recent N. natrix. The fragmentary

7 basiparasphenoid (Figure C) is similar to that coming from Polgárdi 2 (VENCZEL 1994: fig. 8: f, g), having separate foramina for the anterior opening of the Vidian canal and for the re-exit of the constrictor internus dorsalis (= cid) nerve. The pterygoid processes cover the posterior orifices of common foramina. In the prootic the V2 and the V4 foramina exit separately. The characters observed in the basiparasphenoid and prootic are of diagnostic value for N. longivertebrata (SZYNDLAR 1991b, 1991c). The precaudal vertebrae are less elongated (in six vertebrae coming from Osztramos 1 /b the centrum length/centrum width ratio ranges between 1.62—2) when compared to those coming from the type locality (SZYNDLAR 1984). Genus Neonatrix HOLMAN, 1973 cf. Neonatrix sp. (Figure 7: F-J) Figure 7 — Natrix longivertebrata (A-E) and Neonatrix sp. (F-J) from Osztramos 1. — A: supraoccipital (Ol/b), B: proodc (Ol/b), C: basiparasphenoid (Ol/b), D: presacral vertebra (Ol/c), E: compound bone (Ol/b), F—J: precaudal vertebrae (Ol/e). — A, D, G, J: dorsal views; B, E, F, I: lateral views; C, H: ventral views. Material — Osztramos 1/e: 20 presacral vertebrae (HNHM. No. V.99.37). Description and comments — The vertebrae belonged to a small-sized snake. The vertebrae have sigmoid shaped hypapophyses, never reaching the base of the condyle. The neural spine is relatively high, overhanging both anteriorly and posteriorly. The zygosphene is crenate, while the prezygapophyseal processes are relatively short and pointed distally. The paradiapophyses are damaged in all the specimens; the parapophyseal processes are relatively short. The interzygapohyseal ridges are quite well-developed. In ten vertebrae the centrum length ranges between 3.11—3.65 mm, while the centrum width between 2.37—2.92 mm. The centrum length/centrum width ratio is between 1.22—1.45. Remains of Neonatrix from Europe were described by RAGE & HOLMAN (1984), SZYNDLAR (1987, 1991b) and SZYNDLAR «Sc SCHLEICH (1993). According to the latter authors the generic assignment of Neonatrix remains is uncertain: they could belong to a recent Asiatic natricine genus. Family Viperidae OPPEL, 1811 Genus Vipera LAURENTI, 1768 Vipera cf. ammodytes (LINNAEUS, 1758) (Figure 8; Figure 9: A-C) Material — Osztramos 1/b: 2 exoccipitals, 3 prootics, 2 frontals, 2 prefrontals, 3 ectopterygoids, 1 maxilla, 17 vertebrae (HNHM. No. V.99.38); Osztramos 1/c: 10 vertebrae (HNHM. No. V.99.39). Description and comments — The morphology of the cranial bones is similar to those observed in homologous elements of recent V. ammodytes. A small foramen is situated postero-dorsally to the lacrimal foramen of the prefrontal (Figure 8: D). The latter one, in recent V. ammodytes, is situated dorsally to the lacrimal foramen. Some variation is observed in the morphology of the prootic: in two specimens the V2 and V3 foramina are situated in a common recess, while in another specimen they are distinctly separated (Figure 8: B). The shape of maxilla (Figure 8: E, F) and the ectopterygoid (Figure 8: G, Figure 9: A) is similar to