(1, 2) Placoseris eturbensis (de Fromentel, 1857). LFU 8336SG015085. 1. Transversal thin section. 2. Longitudinal thin section. (3–5) Placoseris cf. eturbensis (de Fromentel, 1857). LFU 8336SG015091. 3. Transversal thin section. 4. Transversal thin section, detail. 5. Longitudinal thin section. (6–8) Thalamocaeniopsis cf. taramellii (d’Achiardi, 1880). BSPG 1947 XVI 75. 6. Transversal thin section. 7. Transversal thin section, detail. 8. Longitudinal thin section. (9–11) Thalamocaeniopsis sp. 1, BSPG 1948 III 2. 9. Transversal thin section. 10. Transversal thin section, detail. 11. Longitudinal thin section. Scale bars: 1 mm.