Classification of lamellar foraminifera

"The lamellar foraminifera, which construct their tests by the addition of lamellae of perforate calcite or aragonite, one per instar, covering the whole test, are here recognized as a distinct group and are separated from the non-lamellar foraminifera, which construct their tests by the simple addition, at each instar, of a chamber on the former apertural face. . . . The present classification is based on anatomy, composition and texture of the chamber walls, apertural characters and tooth-plates, canal systems, and chamberarrangement. Although essentially not a phylogenetic ('vertical') one, the present classification supports Hofker's conclusions to a great extent."