Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 72. (Budapest 1980)
Szabó, J.: Lower and Middle Jurassic Gastropods from the Bakony Mountains (Hungary). Part II.: Pleurotomariacea and Fissurellacea (Archaeogastropoda)
growth-lines and fine, dense spiral lines. These latters become gradually weaker from the periphery, reaching only about the middle of the base. Remarks — The specific description of SOWERBY refers to forms without nodes. Most authors (see synonymy) published forms of this type, but some others (e.g. D'ORBIGNY, GOLDFUSS) regarded as Ptychomphalus expansus also those forms with weaker or stronger nodes along the suture. The available material precludes the possibility to re-examine the two interpretations, thus the here adopted name is Ptycomphalus expansus (Sow., 1821). The shell of the species "Cryptaenia nodosa" of SIEBERER (1907) shows no nodes on that very part, where the most entire Bakony specimen is nodose. Distribution — The species is generally represented in the epicontinental, as well as in the Mediterranean Jurassic, in Europe and in northern Africa. The authors mention it from the Lower and Middle Liassic, without further precision. Bakony Mts., Kericser: beds with mixed Obtusum to Ibex Zone faunas; Büdöskút: Margaritatus Zone. Family ?Lophospiridae WENZ, 1938 Genus? WORTHENIA DE KÖNINCK, 1883 The vertical range of the genus Worthenia is widely discussed by the authors, being firstly its extinction is doubtful. In the Treatise (Moore 1960) the genus is mentioned as up to the Middle Triassic, while the Soviet "Bases of Palaeontology" (PÖELINCEV & KOROBKOV 1960) treats it as up to the end of the Paleozoic. WENZ (1938) regarded it as a genus with Upper Triassic extinction. However, disregarding the name, species of world-wide distribution occur also in the Upper Triassic (see e.g. HAAS 1953, KOKEN 1897), which are very closee to Worthenia, and these forms probably have some developmental lines to the Liassic forms described here below. One can suppose that the course of extinction of this genus endured into the Jurassic. The uncertainties are apparently caused by the fact, that similarly-shaped Bathrotomaria Cox, 1956 (Pleurotomariidae) did exist in the Liassic. On the other hand, the available few, poorly preserved specimens do not make possible to decide, whether this case is an example of a pure homeomorphy. Worthenia? superstes sp. n. (Plate I: figs. 10-11) Holotypus : Plate I: fig. 10. — Locus typicus: Bakony Mts., Kericser — Stratum typicum: Hierlatz Limestone — Derivatio nominis: superstes (Lat.) = survivor; referring to the species as a possibly late representative of the genus Diagnosis : Pagodiform shape with carina-like, elevated, crenulate selenizone; base covered with distinct spiral cords, in other parts the ornamental elements are spiral lines. Measurements: H HL HA W D A Plate I: figs. 10-11 24.5 17 17 27 56° Material — Five internal moulds with shell-fragments. Shape — Dextral form with gradate (more precisely pagodiform) spire, with broad, slightlyconvex ramp, which is bordered by a carinated, elevated angulation on the middle of the whorls. This carina is —at the same time —the selenizone. The whorl-surface band between the angulation and the similarly sharp periphery is somewhat convex. The base is convex, without umbilicus. No peristome is preserved in the available specimens. Ornament — The surface of the whorls is covered by fine spiral lines, while the base is ornamented with stronger spiral cords. The most conspicuous ornamental element is the crenulate selenizone-carina running upon the angulation of the mid-whorl. On the carina 2 to 3 fine spiral threads appear additionally. The growth-lines are distinctly prosocline on the ramp, prosocyrt below that, and to the periphery, and opisthocyrt on the base, respectively. Remarks —The form and the ornament of the selenizone distinguishes this form well from all Bathrotomaria species. The juvenile shell, which is missing in the available specimens, would make a more certain generic arrangement possible. On the basis of the studies, the juvenile whorls of Bathrotomaria show the selenizone below the angulation of the whorl. According to the figures of the literature, this is a difference from the Worthenia. Distribution — Bakony Mts., Kericser: beds with mixed Obtusum to Ibex Zone fauna, and Stokesi Zone.
