PLATE XXI. 



Lepidocyclina gigas var. mexicana Cushman, n. var. (p. 63). 



Figure 1. Surface view, X 2. Meson formation, Meson, Vera Cruz, Mexico. 



Figure 2. Surface view, X 2. San Rafael formation, Topila Hills, near Tampico, Mexico. 



Figure 3. Vertical sections, X 10. San Rafael formation, Cerro Cortado, Topila Hills, Mexico. 



