Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 62. (Budapest 1970)

M. Nyírő, R.: Study of the smaller Foraminifera of the Weimpuszta Middle Eocene key section at Nagyesztergár (Bakony Mountains, Transdanubia, Hungary)

Gen. Discorbis LAMARCK, 1804 Diseorbis (?) baeoniea (HANTKEN) 1875 Discorbina baconica, HANTKEN, HANTKEN: M. kir. Földt. Int. Évk., vol. IV> p. 66., pl. X, fig. 3a/b. 1962 Globorotalia baconica (HANTKEN), MAJZON: Földt. Közi., vol. XCIII, Abh. 3, p. 270, pl. XXXVIII (X), fig. 3. This species appears in the Nummulites perforatus horizon. Test wall thicker, more finely perforate, and the last chamber more inflate, than those of the type. Differences in test construction, aperture position, and size prohibit to class it as a Globorotalia. On the other hand, however, the semilunar aperture on the umbilical side makes its being a Discorbis also dubious. The species was described by HANTKEN (1875) from the Szápár Eocene (NE Bakony Mountains, Hungary). Diseorbis limbata (TERQUEM) Plate I, Fig. 7. 1882 Rotalina limbata TERQUEM, TERQUEM: Mem. Soc. Geol. France, ser. 3, vol. 2, p. 80, pi. 8, fig. 6. 1961 Discorbis limbata (TERQUEM), KAASSCHIETER: Inst. Royal, d. Sei. Nat. de Belg. Mem., Mem. No. 147, p. 207, pl. X, fig. 16. 1-2 specimens occur in several beds of the Assilina spira horizon. All are small, with a finely perforate, thin test wall. The spiral side is conical, equippep with a thin edge. The umbilical side is flat, strongly deepened at the centre, where three chambers can be observed. Sutures thin and arcuate. Known in Hungary from the Middle Eocene of the Dorog Basin. MAJZON (1966) registered it as a Lower Eocene species. Lutetian of France, Middle and Upper Eocene of Belgium, Middle Eocene of the Netherlands. Discorbis parisiensis (D'ORBIGNY) Plate I, Fig. 14-15. 1855 Rosalina parisiensis D'ORBIGNY, in PARKER, JONES & BRADY: Ann. Mag. Nat. Hist., vol. 16, ser. 3, pl. 2. fig. 70. 1961 Discorbis parisiensis (D'ORBIGNY), KAASSCHIETER: Inst. Roy. d. Sei. Nat. de Belg. Mem., Mem. No. 147, p. 208, pl. XI, fig. 9, 10. This species appears first in sample 81 (higher part of the Assilina spira horizon), and is rather abundant in samples 86 and 87. The specimens are big and thick-walled in comparison to other species of the association. Wall finely perforate, test flattened, spiral side slightly convex. Five chambers in the last whorl, the youngest one slightly elongated. Ventral side flattened, the chambers and in a thicker edge; concave at the umbilical region, with some pearl-like projections. In Hungary, MAJZON (1966) recorded it from the Lower Eocene. It occurs also in the Middle Eocene of the Dorog Basin. Lutetian of France, and in the Bruxelles sands (Middle Eocene) of .Belgium and the Netherlands.