Metafolliculina andrewsi: Festsetzen des Schwärmers, Abrundung, Bildung des Wohngehäuses und des Gehäusehalses, Kragenbildung. Eufolliculina spec.: Frühe Reorganisationsanlage, Apikalverlagerung und Schleifenbildung, Differenzierung der beiden Peristomflügel, Bildung der Zytostom-Trichterspirale, Anlage der Membranellen. Mit Zeitraffung.

In continuation of the highschool-film C 903 (morphology and cell-division) the film shows the settlement of a swarmer of Metafolliculina andrewsi and the construction of a species-specific case. Before completion of casebuilding the animal develops a large primordium as an construction for a new band of membranelles. The conspicuously pigmented cortical stripe pattern allowed a detailed study of the special phases of "construction development" (anarchic field, formation of membranelles). Trickphotos elucidates that complicated termination of development.