Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 90. (Budapest 1998)

Dulai, A.: Early Jurassic brachiopods from the basal layers of the Pisznice Limestone of Lábatlan (Gerecse Mts, Hungary)

of the Hungarian Geological Institution. This species is known from Hettangian, Sinemurian and Pliensbachian formations of the Transdanubian Central Range (VÖRÖS 1997). Z. mutabilis was figured and described in detail (including the internal characters) by DULAI (1992: 69 and 1993/?: 43). Zeilleria choffati (HAAS) - Several large-sized, elongated specimens were found at both localities and in the collection of the Hungarian Geological Institution. This is the largest species known from the basal layers of the Pisznice Limestone. Z. choffati occurs at several Sinemurian localities of the Transdanubian Central Range (VÖRÖS 1997). This species was figured and described in detail (including the internal characters) by DULAI (1992: 73). Zeilleria cf. batilla (GEYER) - Three fragmentary specimens occur in the upper part of the Tölgyhát quarry. This species has never been mentioned from Hungary in the literature, but several specimens were also found at Borzavár in the Bakony Mts (VÖRÖS, pers. comm). According to ALMÉRAS (1964), Z. batilla is known from the Sinemurian. Zeilleria venusla (UHLIG) - Only a very small-sized juvenile specimen is known from the collection of the Hungarian Geological Institution. Apart from the size of the specimen (its length is 5.8 mm), all features are in good agreement with the well-known form of Z. venusta. This species is known from the Sinemurian localities of the Bakony Mts (VÖRÖS 1997). A detailed description of Z. aff. venusla from Lókút was given by DULAI (1992: 74). Zeilleria sp. - Two specimens occur in the collection of the Hungarian Geological Institution. Both forms are more elongated, than any other zeilleriids known from these localities. Bakonyithyris sp. - Only a small-sized, fragmentary specimen is known from the collection of the Hungarian Geological Institution. This genus was described by VÖRÖS (1983/?) from Hungary and it is known from Sinemurian and Pliensbachian localities of the Transdanubian Central Range (VÖRÖS 1997). * * * Acknowledgements - My sincere thanks are due to Dr. ATTILA VÖRÖS who helped my work throughout with his advice. LÁSZLÓ BENKOVICS, TERÉZ DULAI, PÉTER GERNER and ÉVA ROSTA helped in collecting the brachiopods at Póckő. Dr. LÁSZLÓ KORDOS made the specimens haused in the collections of the Hungarian Geological Institution available for study. I thank Dr. JÓZSEF PÁLFY for his advice and reviewing the English text. REFERENCES ALMÉRAS, Y. (1964): Brachiopodes du Lias et du Dogger. - Dorum. Lab. GéoL, Fac. Sei., Lyon 5: 1-161. BöCKH, J. (1874): A Bakony déli részének földtani viszonyai. II. (Die geologischen Verhältnisse des südlichen Theiles des Bakony. II.) - Ann. Inst. Geol. Puhl. Hung. 3: I — 18t). DULAI, A. (1990): The Lower Sinemurian (Jurassic) brachiopod fauna of the Lókút Hill (Bakony Mts.. Hungary). Preliminary results. - Annls lust.-nat. Mus. natn. hung. 82: 25-37. DULAI, A. (1992): The Early Sinemurian (Jurassic) brachiopod fauna ofthe Lókút Hill (Bakony Mts., Hungary). - Fragtn. Min. et Pal. 15: 41-94. DULAI, A. ( 1993«): Hettangian (Early Jurassic) megalauna and paleogeography of the Bakony Mts. (Hungary). - In: PÁLFY, J. & VÖRÖS, A. (eds): Mesozoic Brachiopods of Alpine Europe. Hungarian Geological Society, Budapest, pp. 31-37. DULAI, A. ( 1993/?): Hettangian (Early Jurassic) brachiopod fauna of the Bakony Mts. (Hungary). -- Fragm. Min. el Pal. 16: 27 50. FÜLÖP, J. (1975): The Mesozoic basement horsl blocks of Tata. - Geol. Hung.. Ser. Geol. 16: 1-229.