Figure 5.1 - 5.20. 5.1-5.5. Planulina renzi Cushman and Stainforth, 1945. 5.1. Spiral view. Holotype. Middle Miocene. Cipero zone VII (upper), Sample Rz.425, Trinidad B.W.I. Smithonian Colllection. USNM 44002. Scale Bar = 112 microns. 5.2. Umbilical view. Holotype. Scale Bar = 109 microns. 5.3. Umbilical view. Oligocene. ODP Leg 184, Site 1148A, 76X-3, 75-80cm. Scale Bar = 131 microns. 5.4. Apertural view of specimen 3. Scale Bar = 127 microns. 5.5. Spiral view. Oligocene. ODP Leg 184, Site 1148A, 76X-2, 70-72cm.Scale Bar = 190 microns. 5.6-5.8. Planulina wuellerstorfi (Schwager), 1866. 5.6. Spiral view. Recent. Lutze collection no. 200, Lutze 1978, West Africa M25, GIK. 5.7. Apertural view of specimen 6. 5.8. Umbilical view of specimen 6. Scale Bar = 161 microns. 5.9-5.11. Pyrgo serrata (Bailey), 1861. 5.9. Side view. Recent. Challenger Station 168, NE coast of New Zealand, South Pacific Ocean (1100 fathoms). Natural History Museum, London. NHM ZF1148. Scale Bar = 337 microns. 5.10. Apertural view of specimen 9. Scale Bar = 302 microns. 5.11. Side view of specimen 9. Scale Bar = 331 microns. 5.12. Stilostomella abyssorum (Brady), 1881. 5.12. Side view. Paratype (designated by Loeblich and Tappan, 1964 from unfigured syntypes). Recent. Challenger Station 296, South Pacific Ocean (1825 fathoms). Natural History Museum, London. NHM ZF 1926. Scale Bar = 226 microns. 5.13. Stilostomella alexanderi (Cushman), 1936. 5.13. Side view. Holotype. Late Cretaceous. Taylor Marl, road cut 14.4 mi S of Paris, 0.9 mi N of Lake City, Delta Co., Texas. Collected by C.T. Alexander, Smithsonian Collection. CC 23254. Scale Bar = 62 microns. 5.14-5.15. Stilostomella annulifera (Cushman and Bermúdez), 1936. 5.14. Side view. Paratype. Middle Eocene? Under the library of Havana University. Bermúdez Station 257, Cuba. Smithsonian Collection. CC 23100. Scale Bar = 237 microns. 5.15. Side view. Oligocene. DSDP Leg 85, Site 573B, 26-CC. Scale Bar = 192 microns. 5.16. Stilostomella paleocenica (Cushman and Todd), 1946. 5.16. Side view. Holotype. Paleocene. Loc 1 NE 1/4 NW1/4 sec. 16, T.1N. R.12W., Little Rock Arkansas. Smithsonian Collection. CC 46415. Scale Bar = 569 microns. 5.17. Stilostomella subspinosa (Cushman), 1943. 5.17. Side view. Holotype. Early Middle Miocene. From the Green clay, Cipero Section #14. San Fernando, Trinidad, British West Indies. Smithsonian Collection. CC 21484. Scale Bar = 443 microns. 5.18-5.20. Uvigerina basicordata Cushman and Renz, 1941. 5.18. Side view. Holotype. Early Miocene. From the Lower Agua Salada Formation, Tocuyo, 18.7 km S (202˚45’) of San Juan de los Cayos, District of Acosta, State Falcon, Venezuela. Smithsonian Collection. CC 35924. Scale Bar = 114 microns. 5.19. Side view. Early Miocene. Eureka borehole E68-151A, 4588', Gulf of Mexico. Scale Bar = 137 microns. 5.20. Apertural view of specimen 19. Scale Bar = 132 microns. (To see enlargement, click on image.)