Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 26. 2008. (Budapest, 2008)
ultimate whorl, these riblets terminate in nodes at abaxial suture. Nodes become increasingly stronger and sparser. On last whorl, nodes appear independendy from riblets in two strengths. Strong nodes developed at intervals of 35° to 36°, with three smaller nodes of equal strength between their pairs. Within space between two strong nodes 13 to 17 riblets visible. Nodes collaterally elongated, and fading out rapidly, especially outwards. Stronger nodes appear in points corresponding to "tips" and side bisectors of former pentagonal whorls, thus earlier pentagonal symmetry retained. Remarks — This species is known only in two incomplete specimens, one from the Bakony Mts and another from the Central Apennines, respectively. Therefore, some characters have remained unknown, like e.g. the inner shell construction that is specific in P. reussii (HÖRNLS, Figure 16 — Pentagonodiscus initiopentagonatus SZABÓ, 1979, and outer (B, C) sides, A-B = Xl; C-D = x3. 1853) and in P.entagonodiscus angustus (WENDT, 1968). The juvenile (approx. 6) whorls of P. initiopentagonatus resemble those of P. reussii. The difference, on the basis of this limited material, is the stronger sculpture, the stronger divergence from the normal spiral coiling and the smaller whorl-width in P. reussii. The diameter of the pentagonal shell part in P. initiopentagonatus is 8 mm. In a diameter bigger than this, a distinction from P. reussii is more reliable. After this stage the specific features of P. initiopentagonatus develops: i.e. the loss of the pentagonal outline, the appearance of a different sculpture. In P. reussii the habit of the shell remains unchanged up to the adult stage (12 to 15 mm in diameter). Distribution — Bakony Mts (Hungary 7 ): Lókút, Kericser, Pliensbachian (Davoei Zone); Central Apennines (Italy), Pliensbachian. efiguration of the holotype (HGM J 9594) — A-D: spiral (A, D) Order Vetigastropoda SALVINI-PLAWÉN, 1980 Superfamily Pleurotomarioidea SWAINSON, 1840 Family Eotomariidae WENZ, 1938 Genus Ptychomphalus AGASSIZ, 1839 Type species: Helicina compressa]. SOWERBY, 1813 Ptychomphalus expansus (SOWERBY, 1821) (Figure 17) 1821: Helicina expansa SOWERBY — Sow i.RBY, J., vol. 3, p. 129, pi. 273, figs 1-3. 1830: Helicina expansa SoViTRBY — ZIETEN, p. 43, pi. 33, fig. 5. pars 1844: Rotella expansa Sow I.RBY — MONSTER in: GoLDlTSS, p. 102, pi. 195, figs 8-9. ? 1849: Pleurotomaria suturalis — J. A. EUDES-DESLONGCHAMPS, p. 147, pi. 17, figs 3 a-d. non 1853: Pleurotomaria expansa D'ORB. — D'ORBIGNY, p. 413., pi. 352., fig. 1-4. 1854: Pleurotomaria expansa SOWERBY — CHAPUIS & DEWALQUE, p. 97, pi. 13, fig. 3. 1858: Pleurotomaria expansa SoWERBY — Ql'HNSTEDT, p. 193, pi. 24, fig. 3. 1861: Pleurotomaria expansa SOWERBY — STOLICZKA, p. 185, pi. Ill, fig. 16. 1874: Pleurotomaria expansa Sow L.RBY — GEMMELLARO, G. G, p. 94, pi. 12, fig. 20. 1907: Cryptaenia expansa SOWERBY — SlEBERER, p. 25, pi. 1, figs 5 a-c. 1911: Cryptaenia expansa SOWERBY — GEMMELLARO, M., p. 214, pi. 10, figs 13-19. ? 1937: Cryptaenia expansa SOWERBY — PCHELINCEV, p. 24, pl. 1, fig. 25.
