Image source: Cushman, J.A. 1930. The Foraminifera of the Atlantic Ocean. Part 7. Nonionidae, Camerinidae, Peneroplidae and Alveolinellidae. Bull. U.S. Natl. Mus. 104.
Image source: Cushman, J.A. 1933. The Foraminifera of the Tropical Pacific Collections of the ”Albatross”. Part 2. Lagenidae to Alveolinellidae. Bull. U.S. Nation. Mus 161: vi+79 pp.+19 pls.