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

inflated with maximum convexity near the umbo. It has a wide and flat fold corresponding to the sulcus. The lateral comissure is strongly and doubly arched, the anterior one is highly uniplicate in a tongue-shape (Fig. 2). Apart from the growth lines on the posterior part of some specimens, the surface of the shell is entirely smooth. Internal structures: Transverse sections were made of a damaged specimen, thus the whole umbonal region could not be observed. The dental plates are thin. The falcifer crura are rather thick and they are incurved both on ventral and dorsal side towards the middle of the shell. Becoming thin, they turn into nearly horizontal plates (Fig. 3). Fig. 3 Transverse sections through Monticlarella sp. (Eperkés-hegy) Remarks : There is a smooth specimen without costae figured by SMIRNOVA (1972) as Lacunosella moutoniana, but that is acutely uniplicate. The form described above is entire ly smooth with a rounded plica. On these external characters it can be assigned to Monti clarella. Its internal structures also differ from those of Lacunosella.