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)

and SACCHI VIALLI (pl. 1, figs. 2a-c!) and PCELINCEV — all from Mediterranean areas. The row of elongated ridges described above could have been traced only in the figures of STOLICZKA. It is possible, that these forms are distinguished from PL anglica. On the other hand, the group of the forms described as Pi. anglica is rather large, and all transitions exist amongst the extremes. Thus, the precise distinction needs further studies. (N.B. The synonymy recorded here is incomplete!) The similarly depressed PI. escheri MÜNSTER has a cancellate ornament as against the dominant longitudinal sculpture of Pi. anglica, and the former shows transverse ridges parallel to the growthlines. Additionally, the tubercles are rarer, just as in PL armata MÜNSTER, which has more convex base, generally wider spire angle and tubercles, which are elongated rather longitudinally. Distribution — Europe: Lower and Middle Liassic. Bakony. Mts., Eplény: Domerian. Pleurotomaria sp. Material — A single, poorly preserved specimen. Shape — Dextral, conical form. The surface of the whorls is convex. The selenizone runs in the middle of the whorls. Ornament — The ornamental elements are longitudinal spiral cords and transverse, orthocline growth-lines and ribs which arise at the suture and fade out before reaching the selenizone. Remarks — The preserved shell shows only the above-mentioned features. These suggest that the specimen differs from the other represented species, but is insufficient to closer determination. Distribution — Bakony Mts., Kisnyerges árok: Lower Pliensbachian (Jamesoni to Ibex Zones) Subgenus ANODOMARIA subgen. n. Type species: Pleurotomaria (Anodomaria) scacchi GEMMELLARO, 1874. Derivatio nominis: Referring to that these forms are Pleurotomaria without nodes. Diagnosis : Shape identical to that in Pleurotomaria: with pentagonal whorl-section, gradate-trochiform spire, selenizone situating below the angulation of the whorls, in mid-whorl position. In contrast to subgenus Pleurotomaria, Anodomaria shows no tuberculations in any portions of the shell. The ornament consists only of longitudinal and transverse threads and cords. Remarks — The shape and the ornament of the juvenile shell of subgenus Pleurotomaria resemble those in Anodomaria. Similar is the case in genus Bathrotomaria. Other genera of the family Pleurotomariidae can be distinguished from those mentioned above by the shape of the embryonal shell. Pleurotomaria (Anodomaria) scacchi G. GEMMELLARO, 1874 (Plate II: figs. 6-7) 1874: Pleurotomaria scacchi GEMM. — GEMMELLARO, G. G., p. 92, pi. 12, fig. 18. Measurements: H HL HA W D A Plate II: figs. 6-7 12.5 8.5 15.5 52° Material — Two (+ one?) fragmentary specimens. Shape — Dextral form with gradate spire. The whorl-section is nearly pentagonal. On the whorl-surface, below the suture, runs a narrow ramp, which is bordered abapically by a rounded angulation. The shell is somewhat concave between this angulation and the similarly rounded-angular periphery. The wide selenizone is situated in the deepest part of this concave portion. The base is flattened, and rounds into the wide, open umbilicus with an angulation. Peristome is unknown. Ornament — The whorl-surface and the base is covered by network of rather evenly spaced and regularly strengthened spiral and transverse cords. One of these spiral cords divides the selenizone into two parts. The growth-lines are extremely fine and prosocline above the selenizone, prosocyrt between the selenizone and the base, and opisthocyrt on the base, becoming prosocline again on the umbilical curve. The continuous course of the transverse ornamental elements are disrupted only by the selenizone, but the lunulae of corresponding strength are visible upon that. Remarks — The available specimens can be easily identified to the excellent description of Gemmellaro. Distribution — Western Sicily: "Terebratula aspasia Zone"; Bakony Mts., Kericser: Davoei to Stokesi Zones; Hamuháza: Stokesi Zone.