Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 18. 1996. (Budapest, 1996)

Comparison: B.l appenninica Oertli, 1967 has a similar outline, but its ends are more stubby and the right valve has not an obviously trapezoidal character. Dimensions: L = 0.91 - 1.10 mm, H = 0.59 - 0.66 mm, L/H = 1.54 - 1.67 Material: 2 specimens. Bairdia ? sp. 1. (Pl. IV: 1) Remarks: A fragmentary and relatively high form with distinct, dense pits on the lateral surface. Material: 4 specimens. Genus Lobobairdia Kollmann, 1963 Lobobairdia rotunda sp. n. (Pl. IV: 2-8) Derivatio nominis: After its circular form . Locus typicus: Hárskút, Közöskút-Ravine. Stratum typicum: Carixian, Ibex Zone, sample No. 2.. Diagnosis: Very highly rounded form with a break between the anterior/posterior parts and the other part of the valve. There is a weak remnant of the typical nearmarginal rim. Description: The anterior outline of the left valve is broad and nearly symmetrical, the dorsal arch is wider and also symmetrical. The posterior outline is asymmetrical, its upper part is nearly straight, the lower part is rounded. The ventral outline is straight or slightly convex. The posterior end is rather obtuse. The anterior and posterior parts of the valve are depressed, the inflated main part of the valve emerges from those. The weak remains of the characteristic circular swelling are sometimes visible anteriorly and posteriorly. The right valve is overlapped by the left one throughout, its shape is typical of "Bairdia", with trapezoidal dorsal outline, more asymmetrical anterior and posterior outline, concave ventral outline and more acute posterior end. The ornamental remains are similar to those of the left valve. Comparison: The shape and outline is very similar to Bairdia fortis SeilacherDrexler, 1968 in Harloff, 1993, the Lobobairdia ornamentation remains are typical for the Hungarian material. Dimensions: L = 0.77 - 1.39 mm, H = 0.61 - 1.05 mm, L/H = 1.26 - 1.38 Guv.? L = 0.50 - 0.63 mm, H = 0.39 - 0.50 mm, L/H = 1.22 - 1.39). Mateial: 228 specimens. Genus Ptychobairdia Kollmann, 1960 Ptychobairdia lordi sp. n. (Pl. V: 1-2)