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Image source: Cushman, J.A. 1911. A Monograph of the Foraminifera of the North Pacific Ocean. Part II. Textulariidae. Bull. U.S. Nation. Mus 71: xiii+108 pp.
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Image source: Cushman, J.A. 1911. A Monograph of the Foraminifera of the North Pacific Ocean. Part II. Textulariidae. Bull. U.S. Nation. Mus 71: xiii+108 pp.
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Image source: Cushman, J.A. 1942. The Foraminifera of the Tropical Pacific Collections of the ”Albatross”. Part 3. Heterohelicidae to Buliminidae. Bull. U.S. Nation. Mus 161: v+67 pp.+15 pls.
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Cushman, J. A. (1936). New genera and species of the families Verneuilinidae and Valvulinidae and of the subfamily Virgulininae. Special Publ. No. 6, Cushman Lab. Foram. Res. 1-71., available online at (https://babel.hathitrust.org/cgi/pt?id=uc1.b4339593) page(s): p. 50, pl. 7, fig. 13a-b