Boros István (szerk.): A Magyar Természettudományi Múzeum évkönyve 50. (Budapest 1958)
M. Nyírő, R.: The studying of Foraminifera in thin sections
Textularia carinata d'Orb. Plate figs. la-b. A form in the shape of a braid of hair, characteristical also in a thin section. The initial chamber is circular. The older chambers first appear in an involuted form and only from the fifth chamber on does the characteristical braid-like or biserial structure appear. The single chambers are elongated. The old apertures are well visible between the chamber walls in the median line. The material of the test consists mainly of minute calcite grains, cemented also by CaCo 3 . This is proven by solving in hydrochlorid acid, as also by an examination with a polarizing microscope. The inner separating walls of the chambers are thick, especially well observable in younger chambers. The characteristical rim will about disappear during cutting. Number of chambers : 22—24. Textularia deperdita d'Orb. Plate figs. 2a-b. Even the younger chambers develop immediately into the braid-like structure. Number of chambers : 10—12. Its material is agglutinated from calcite grains, the same as that of Textularia carinata. Vulvulina pectinata Hantk. Plate figs. 5a-b. An arenaceous form of fine, minute calcite grains ; the older chambers take the shape of a narrow, elongated test. The younger chambers take a broader form, due to their shape. The separating walls of the younger chambers are thinner. The apertures of the chambers can be seen on the thin sections in the younger ones only, and those too along the median line. Number of chambers : 25—26, joining each other in the shape of a roof. Vulvulina capreolus d'Orb. Plate figs. 4a-b It makes a big, broad test of fine mineral materials with a chalk cement. The shape of the chambers is elongated, bending downwards. The line of the walls of its chambers presents an S-shape in the older chambers, that of the younger ones flows gradually into the external wall. The aperture is big between the younger chambers. The last chamber embraces, that is, covers, the two older ones. This is a very characteristical feature of the species, differring thereby from sublabelliformis. Number of chambers : 16—18. j Gaudryina siphonella Rss. Plate figs. 6a-b An elongated form. Agglutinated from fine mineral grains. Tapering toward the older chambers. The torsional structure is observable also in thin sections. 3 Természettudományi Múzeum Évkönyve
