Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 14. 1989. (Budapest, 1989)

Family WELLERELLIDAE Subfamily Lacunosellinae Genus Lacunosella Wisniewska, 1932 Lacunosella moutoniana (d'Orbigny, 1846) (Plate I: 9-16) 1847. Rhynchonella Moutoniana d'Orbigny, 1846. - D'ORBIGNY, p. 15, pi. 494, Figs. 16-19 1907. Rhynchonella moutoniana d'Orbigny - KARAKASCH, p. 204, pi. 21, Fig. 10 1907. Rhynchonella eichwaldi - KARAKASCH, p. 206, pi. 21, Figs. 2,4,6 1907. Rhynchonella cf. malbosi - KARAKASCH, p. 207, pi. 21, Figs. 1, 15 1907. Rhynchonella tschernisewi - KARAKASCH, p. 208, pi. 21, Fig. 3 1945. Rhynchonella eichwaldi Karakasch - NOUTSOUBIDSE, p. 221, pl. 1, Figs. 1-2 Material: 2 brachial valves from the Közöskutiárok, 5 complete specimens, 14 pedicle and 10 brachial valves from the Bocskor-hegy. Dimensions (mm): L 10 W 9. 5 T 6. 9 9 9.6 5. 7 De

scription : The outline of the shell is rounded pentagonal or circular with a triangular posterior and a trapezoidal anterior part. Maximum width and maximum thickness are at about the mid-line of the shell, the latter can be somewhat posterior of the mid-line. The umbo is short and pointed with a small and rounded foramen. Beak ridges are inconspicuous. 1 cm Fig. 4 Lacunosella moutoniana a= lateral view; b~ anterior view Deltidial plates are well visible. The interarea is short and wide. The posterior part of the brachial valve is unusually convex, bulges as far posteriorwards as the ventral umbo. The pedicle valve is flat with the maximum convexity near the umbo. It has a widening sulcus which develops in the anterior half of the shell and contains 1 to 4 sharp and often asymmetrically arranged ribs. The lateral comissure runs straightly ventralwards in the posterior half of the shell, then abruptly turns dorsalwards. The anterior margin is highly uniplicate. Intraspecific variability is significant, affecting the width of the shell, depth and width of the sinus and number of ribs (Fig. 4). Internal structures: The slightly diverging dental plates are narrow. The teeth are oriented almost ventralwards. The sockets are rounded, the teeth fit close to the sockets. Outer and inner socket ridges are present. The crura are of falcifer type. The crural plates turn towards the middle of the valve at the end, then, becoming straight, they slightly diverge (Fig. 5).