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

tral side by an edge. The lateral and anterior comissures are straight. The long median septum reaches 1/2 the length of the brachial valve. Remarks: The external characters of this form agree with those of Belothyris pseudo jurensis Leymerie. Unfortunately, I could not observe the internal structures. It differs from d'ORBIGNY's figures 11, 14 and 15 in that the outline is circular or pentagonal, the brachial valve is not sulcate, the anterior comissure is straight, the valves are more inflated. Its appearance agrees with that of the Albian Terebratula dzirulensis Anthula 1898. NOUTSOUBIDSE also described this species as Dzirulina dzirulensis Anthula. The Bakony form differs little from it, except in having a straight anterior margin. NOUTSOUBIDSE also described the internal structures of the species, differing markedly from those of Belo thyris Smirnova. Nevertheless, I find it odd that SMIRNOVA does not even mention the genus Dzirulina in her referred paper. Our form differs from Belothyris reguláris Smirnova, 19 60 in being laterally more inflated with a sub-rectangular cross-section and having an umbo bending over the brachial valve. OWEN (19 70) does not even refer to Belothyris reguláris, in spite of the fact that it must be a close relative of Belothyris pseudojurensis. To sum up, two problems appear in the literature: firstly, the species Dzirulina dziru lensis seems to be forgotten. Secondly, the comparison of the Belothyris-fauna of western Europe and that of the Caucasus and Crimea is insufficient. Distribution: Hauterivian and Valanginian of northern Germany; Neocomian and Hauterivian of France and Switzerland. Belothyris sp. (Plate IV: 11-17) Material : complete pedicle brachial specimen valve valve Szilas-árok 1 Bocskor-hegy 3 6 Eperkés-hegy 1 35 Description: The shell is rounded pentagonal with a triangular posterior part and a trapezoidal anterior one. Both valves are inflated, the pedicle one is more convex. Maximum convexity is near the umbo in both valves. The umbo is suberect with large, circular foramen. The symphytium is short, the beak-ridges are inconspicuous. The lateral comissure is doubly arched, the anterior one is strongly and broadly sulcate with a trapezoidal, linguiform sinus (Fig. 19). Growth lines can be observed, increasing in density anteriorly. The shell is punctate. Internal structures: Transverse sections were made of a brachial valve from the Bocskor-hegy. The median septum, originating from the beak, may reach 2/3 the I 1 cm f length of the valve. The crural bases and _. ,„ the crura are annular in cross-section. Fig. 19 Belothyris sp. Remarks: Though the only complete specia= lateral view; b= anterior view men described above is an adult, it is considerably smaller than the others. Specimens from the Eperkés-hegy are rather compressed, no accurate description can be given of them. This form differs from all previously described species of Belothyris in having a deeply sulcate anterior margin. On the other hand, it can be assigned to this genus on characters such as the rounded pentagonal outline, the punctate shell and the long median septum.