Boros István (szerk.): A Magyar Természettudományi Múzeum évkönyve 52. (Budapest 1960)

Agócsy, P. ; Pócs, T.: Data to the mollusk fauna of Hungary

The characteristical shells, occurring in the highest numbers, of this area are Helix lutescens and Fruticicola fructicum. Imparietula tridens and Aegopinella nitens are abundant in the forest litter near Baktalórántháza. Pyramidula rupestris, new for the Great Plains, is striking under the bark of trees and in their decay. In Bereg, on the outskirts of the village Tákos, the edge of the Bockerek forest touches on the sphagnum moor reservation near Csaroda. Aside of swampinhabiting species (Planorbis leucostoma), we found here Vallonia species, Monachoides vicina, Vitrea crystallina, Trichia hispida. These latter ones are all montane species, rather rare in the Great Plains. We have explored also the peat-moors, hiding many relict animal species, near ócsa not far from Budapest. The most interesting find is Pomatias elegáns, known hitherto from Tihany only. Its subfossile shells have been found in several places in the country, indicating the fact that it lived in many sites not long ago. Dr. A. Horváth found living specimens in Ócsa, and we also succeeded to happen on a living one at a higher point of the alderwood forest. In the same place, we found many empty, more or less fossilized, shells. In the sandy localities of Ócsa, Helicella hungarica lives at the bases of Festuca vaginata clumps. This animal leads a very hidden life. Its living species can be found only on the surface of the ground in rainy weather or during nights rich in dew. Fig 3. The ranges of Ruthenica Jilograna Rossmassler (circle), Papillifera bidens L. (quadrangle), and Balea perversa L. (triangle) in Hungary. We began our collectings on the Csepel Island in the autumn of 1959. The living specimens of some rare species found their way from the wash of the Danube into the inundated woods, and, finding suitable conditions, they set foot there. This seems to be a fair explanation for the occurrence here of Trichia striolata ssp. montana of a NW European-Alpine range, found in the inundated forest near Szigetújfalu, accompanying Cochlodina laminata, Arianta arbustorum,