This translation from the Russian language [Akad. Nauk SSSR Geol. Inst. Voprosy Mikropaleontologii, v. 10, p. 80-87, 1966] has been revised so that the term primatheca may be applied to a primary layer, the spirotheca of the fusulinid subfamily Schubertellinae, and so that the new species name Schubertella parva may replace the homonym S. minima. Also, this translation incorporates the first description of a species of the genus Toriyamaia from North America, T. americana, and it contains descriptions of the following species of the genus Schubertella that were new in the Russian publication: S. canutilloensis, orbiculata, longissima, and provecta.

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