Boros István (szerk.): A Magyar Természettudományi Múzeum évkönyve 50. (Budapest 1958)

M. Nyírő, R.: The studying of Foraminifera in thin sections

The walls of the chambers radiate towards the umbilicus. The perforation of the walls are but slightly visible. There are no apertures visible on the chamber walls. Number of whorls : 4. Number of chambers : 27—28. Cibicides lobatulus (Walk.-Jon.) Plate figs. 12a-b The initial chamber is circular. The younger chambers are narrow, elongated, the separating walls tend radially towards the umbilicus. The last chamber, related to the others, is inflated, bigger. This influences the shape of the whole specimen. It is slightly perforated. The apertures of the chambers are not discernible. There are but 5 chambers visible in a cross section. Number of chambers: 18—20. Summary Of the few

r Foraminifera species examined up to now, dimorphism could be shown for Textularia depertita d'Orb., Marginulina gladius, and Robulus inornatus. There is a trimorphism in the case of Uvigerina pygmaea d'Orb. Explanation of the Plate 1 a. Textularia carinata d'Orb.; a whole specimen 1 b. Textularia carinata d'Orb.; a thin section 2 a. Textularia deperdita d'Orb.; a whole specimen 2 b. Textularia deperdita d'Orb.; a thin section 3 a. Clavulinoides szabói (Hantk.); a whole specimen 3 b. Clavulinoides szabói (Hantk.); a thin section 3 c. Clavulinoides szabói (Hantk.); a thin section published by Hagn 4 a. Vulvulina capreolus d'Orb.; a whole specimen 4 b. Vulvulina capreolus d'Orb; a thin section 5 a. Vulvulina pectinata Hantk.; a whole specimen 5 b. Vulvulina pectinata Hantk.; a thin section 6 a. Gaudryina siphonella Reuss.; a whole specimen 6 b. Gaudryina siphonella Reuss.; a thin section 7 a. Nodogenerina badensis (d'Orb.); a whole specimen 7 b. Nodogenerina badensis (d'Orb;.); a thin section 8 a. Marginulina fragaria Gümb.; a whole specimen 8 b. Marginulina fragaria Gümb.; a thin section 9 a. Uvigerina pygmaea d'Orb.; a whole specimen of the megalospheric form 9 b. Uvigerina pygmaea d'Orb.; a thin section of the megalospheric form 9 c. Uvigerina pygmaea d'Orb.; a whole specimen of the microspheric form 9 d. Uvigerina pygmaea d'Orb.; a thin section of the microspheric form 10 a. Cibicides ungerianus (d'Orb.); a whole specimen 10 b. Cibicides ungerianus (d'Orb.); a thin section 11 a. Robulus inornatus (d'Orb.); a whole specimen 11 b. Robulus inornatus (d'Orb.); a thin section of the megalospheric form lie. Robulus inornatus (d'Orb.); a thin section of the microspheric form 12 a. Cibicides lobatulus (W.

—J.); a whole specimen 12 b, c. Cibicides lobatulus (W.

—J.); thin sections 13 a. Planulinella osnabrugensis (Münst.) a whole specimen 13 b. Planulinella osnabrugensis (Münst.) a thin section