Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 74. (Budapest 1982)

Szabó, J.: Lower and Middle Jurassic Gastropods from the Bakony Mountains (Hungary). Part IV.: Neritacea, Craspedostomatacea, Amberleyacea (Archaeogastropoda)

features are lacking from them, thus some uncertainty has remained. The Crossostoma pratti (MORRIS & LYCETT, 1851) has a higher and more convex last whorl, and its spire is more depressed. Genus CHARTRONELLA COSSMANN, 1902 Chartonella noszkyi sp. n. (Plate II: figs. 7-8) Holotypus : Plate II. figs. 7-8, Locus typicus: Eplény, Manganese Ore Mine; Stratum typicum : Domerian vertical fissure-filling limestone; Derivatio nominis : after the collector, JENŐ NOSZKY (jun.) who was an excellent Hungarian geologist. Diagnosis : dextral, turbiniform, with a whorl-surface consisting of three bands ; one of these amounts to a ramp, and they are separated by carinae; convex base without an umbilicus; a thick parietal callosity and a strong columella; outer lip prosocline; the shell is covered by fine longitudinal lineation. Measurements: H HL HA D W A Plate II: figs. 7-8 24 16 12 19.5 11.5 69° Material : One of the available three shelly specimens is rather well preserved. Shape : Dextral, moderately high turbiniform, thick-walled shell. The convex surface of the whorls is divided into three longitudinal parts being roughly equal in width. The uppermost one of these forms a narrow ramp. The bands are flattened and bordered by the suture and carinate angulations, the number of which is two on the previous whorls and three on the last whorl. The lowermost keel is just overlapped by the suture. There is no umbilicus on the convex base. The rounded peristome is prosocline, particularly at its outer lip (being damaged, its orientation is given by the growth-lines). A narrow and shallow furrow separates the thickened inner lip from the low ridge founded on the base from the parietal lip to the foot of columella. Ornament : Below the carina running on the abapical rim of the ramp, a spiral cord appears on the juvenile part and it endures to the peristome. Other cords are also present on the juvenile shell, but they disappear on the penultimate whorl. Besides the mentioned spiral elements, fine lines both on the base and the spire observable. The growth-lines are prosocline, somewhat sigmoidal on the whorls and parasigmoidal on the base. Distribution : Bakony Mts., Eplény: Domerian. Remarks : On the basis of the rather gradate outline and the tricarinate last whorl (and bicarinate preceding ones) Chartronella noszkyi sp. n. is distinguishable from the majority of its congeners. The form comparable to the new species is HUDLESTON'S "Trochus spiratus d'Achiac", especially the specimen on pl. XXXI. fig. 7 having a tricarinate last whorl, but diners by its somewhat cyrtoconical shape with a less deep suture than Ch. noszkyi sp. n. Moreover, the secondary spiral sculptural elements are rarer and stronger, than on Chartronella noszkyi sp. n. Genus BOECKHIA gen. n. Type species : Boeckhia boeckhi gen. & sp. n. (see below) ; Derivatio nominis: after the excellent Hungarian geologist JÁNOS BÖCKH, who described the only gastropod species from the Jurassic of Bakony Mts. before the present series. — Diagnosis : Dextral, small to medium sized, turbiniform-sublenticular, thick-walled; the conical spire is separated by a carinate-angular periphery from the subglobose base; whorls are flattened or somewhat convex,usually with a slightly concave band above the carina ; groove-like suture runs at or just below the carina of the former whorl ; aperture nearly circular; peristome subquadral, prosocline especially at the outer lip, which is more or less thickened; always strong inner lip widening below and limited by two angulations; a significant parietal callosity is present; anomphalous, usually with pseudoumbilicus or possibly narrowly phaneromphalous; ornament of spiral threads crossed by fine prosocline growth-lines. Distribution : Lower and Middle Jurassic in the Mediterranean Region and ? NWEurope.