Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 44, Figs. 15-16. L. Cretaceous (Aibian), Duck Creek Formation, Grayson County, Texas, USA. 15, Side view showing broad and closely appressed chambers, x 100; 16, enlargement of surface to show very finely agglutinated wall, x 700 (new SEM figures).
