Plate 11. 1, 2 Gyroidina umbonata (Silvestri); 1 umbilical view and 2 peripheral view. 3, 4 Hanzawaia boueana (d’Orbigny); 3 umbilical view and 4 spiral view. 5, 6 Ammonia parkinsoniana (d’Orbigny); 5 umbilical view and 6 spiral view. 7, 8 Elphidium aculeatum (d’Orbigny); 7 peripheral view and 8 umbilical view. 9, 10 Elphidium advenum (Cushman); 9 umbilical view and 10 peripheral view. 11 Elphidium complanatum (d’Orbigny), umbilical view. 12, 13 Elphidium decipiens (Costa); 12 peripheral view and 13 umbilical view. 14 Elphidium jenseni (Cushman), umbilical view. 15, 16 Elphidium macellum (Fichtel & Moll); 15 umbilical view and 16 peripheral view. 17 Elphidium margaritaceum Cushman, umbilical view. Each scale bar represents 100 microns.