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

Bairdia longoarcuaia sp. n. (PI. III: 2-3) Derivatio nominis: From its large ventral arch. Locus typicus: Kericser. Stratum typicum: Domerian, Spinatum Zone. Diagnosis: The lower side of the outline is like a symmetrical arch because of the form of the lower part of anterior and posterior outlines. Description: The anterior outline of left valve is very asymmetrical, its lower part broadly rounded, upper part somewhat concave. The dorsal outline is symmetrically arched, sometimes has trapezoidal shape. The upper part of the posterior outline is concave, the lower part is nearly straight, the caudal end is pointed and upward directed. The ventral outline is straight or fairly convex. There is a weak depression below the mid-dorsal part of the outline. Comparison: B. aselfingensis Lord & Moorley, 1974 has a similar shape, but its lower anterior outline part is more abrupt, the caudal process is narrower and less upward directed, and there is a circum-marginal depressed area. Dimensions: L = 0.52 - 0.73 mm, H = 0.31 - 0.41 mm, L/H = 1.66 - 1.82 Material: 18 specimens. Bairdia michelseni arcuatocauda ssp. n. (PI. 111:4-7) Derivatio nominis: After its caudal process directed more upwards than that of the nominate subspecies. Locus typicus: Hárskút, Közöskút Ravine. Stratum typicum: Carixian, Ibex Zone, sample No. 2.. Comparison: The caudal process is generally smaller and more upward directed, the anterior outline is more narrowly rounded as compared to the type material. The shape variation is large similarly to the nominate subspecies. Dimensions: L = 0.75 - 1.67 mm, H - 0.43 - 0.93 mm, L/H = 1.50 - 1.93. Material: 267 specimens. Bairdia trigonosymmetrica sp. n. (Pl. Ill: 8) Derivatio nominis: After its triangle shape. Locus typicus: Kericser. Stratum typicum: Domerian, Stokesi Zone. Diagnosis: Nearly symmetrical triangular form. Description: The anterior outline of the left valve is fairly asymmetrical and narrowly rounded. The dorsal outline is a high arch. The posterior outline is somewhat asymmetrical and narrowly rounded similarly to the anterior one. The ventral outline is straight. The right valve has a trapezoidal dorsal outline with short median part, the posterior end is more pointed, the posterior outline asymmetric, its upper part is fairly concave, the lower part is convex, the ventral outline has a shallow asymmetrical sinus. The surface is smooth, there is a narrow and fair depression near the antero- and posteroventral margins.