Cruciloculina d'Orbigny, 1839, regarded by many authors as synonymous with Triloculina, is shown to be a valid genus. New material from Pliocene formations of Japan demonstrates that "the aperture in Cruciloculina is cruciate in the young and labyrinthic in the adult, while in Triloculina the aperture is provided with a bifid or plate- like tooth." An emended generic diagnosis of Cruciloculina, and a description of C. japonica n.sp. are included.

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