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

Description — The jugal area of the intermediate valve is smooth while the lateral areas are ornamented by 5-5 longitudinal, granulated ribs. The edges of the jugal area are slighdy undulated. Both the jugal area and the lateral areas bear lots of small pores. The pores are irregularly arranged at the jugal area, and they are situated at the centre of the granulations at the lateral areas. Small pores can also be seen on the inner surface of the intermediate valve, but only at the jugal area. The pores are oval in outline at the inner side of the valve. The apex of the only valve is ended in about 120° angle. The length of the suturai plates of the intermediate valve is about 1 /4 of the whole length of the valve. Remarks — This specimen definitely differs from the widespread European Miocene species, Cryptoplax weinlandi SULC. The new species has a smaller size and granulated ribs on the lateral areas. The pores are oval in outline at the inner side of the valve, while rounded in outline at Cryptoplax weinlandi SULC. It is more similar to the recent Cryptoplax enigmaticus described by LELOUP (1980), that has 4—6 granulated ribs on the lateral areas. However, there is a significant difference in the length of the suturai plates. It is about half of the whole length of the valve at the recent species, while hardly 1/4 at the Miocene species. There is no indication about the pores in the description of Cryptoplax enigmaticus LELOUP, which probably refers to another significant difference between the two species. Distribution — Up to now, this species is known only from the Hungarian Miocene. ACKNOWLEDGEMENTS — This study was supported by the Hungarian Scientific Research Fund (OTKA F 13975). Many thanks are due to Dr. Margit BOHN-HAVAS for the samples of borehole Szokolya-2. The SEM photos were taken in the SEM Laboratory of the Hungarian Geological Institute by Mrs. TAKÁCS and Mrs. PELLÉRDY. I wish to thank Pál MÜLLER (Hungarian Geological Institute) and Miklós MONOSTORI (Eötvös University) who reviewed the manuscript of this paper and contributed to its improvement. References BÁLDI, T. & KÓKAY, J. (1970): A kismarosi tutit faunája és a börzsönyi andezitvulkánosság kora. (Die Tuffit-fauna von Kismaros und das Alter des Börzsönyer Andesitvulkanismus). — Földtani Közöny, 100: 274-284. BALUK, W. (1971): Lower Tortonian chitons from the Korytnica clays, southern slopes of the Holy Cross Mts. — Acta Geologica Polonica, 21(3): 447-472. BALUK, W. (1984): Additional data on chitons and cutdefish from the Korytnica Clays (Middle Miocene; Holy Cross Mountains, Central Poland). —Acta Geologica Polonica, 34 (3-4): 281-297. BOETTGER, O. 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, 4: 581—617. REUSS, A. E. (1860): Die marinen Tertiärschichten Böhmens und ihre Versteinerungen. — Sitzungsberichte der MaiematischNaturwissenschaftlichen Classe der Kaiserlichen Akademie der Wissenschaften, 39: 207-285. ROCHEBRUNE, A. T. (1883): Monographie des espèces fossiles appartenants á la classe des Polyplaxiphores. — Annales des sciences géologiques, 14: 1—73. SACCO, F. (1897): / Molluschi dei terreni tennarii del Piemonte e delta Liguria, 22: 1-130. SMITH, A. G. (1960): Amphineura. — In: MOORE, R. C. (editor): Treatise on Invertebrate Paleontology, Part I (Mollusca 1). — 141—176, Lawrence, Kansas. Explanation to Plate III 1-6 Cryptoplax weinlandi SULC, 1934; tail valve; Szokolya-2, 92.7-93; M.99.112. — 1: dorsal view, x 30; 2: ventral view, x 30; 3: ventral view (detail of Plate III: 2), x 80; 4: frontal view, x 55; 5: dorsal view (detail of Plate III: 1), x 300; 6: ventral view (detail of Plate III: 3), x 500.