PLATE 2 



Figs, i, 2. Achomosphaera sagenasp. nov. Holotype. PF. 3041(1). Precingular arch- 

 aeopyle shown. X500. Fig. 2. Surface reticulation in focus. X 1250. 



Fig. 3. Achomosphaera ramulifera (Deflandre). Cenomanian (boring depth, 840 feet). 

 Precingular archaeopyle shown. FM. 840(1). X500. 



Fig. 4. Hystrichosphaera cingulata var. reticulata nov. Cenomanian (boring depth, 

 730 feet). Lateral view, archaeopyle towards the north-west. PF. 3039(2). X5000. 



Fig. 5. Cleistosphaeridium flexuosum sp. nov. Holotype, PF.3045(i). X500 (phase 

 contrast) . 



Fig. 6. Cleistosphaeridium heteracanthum (Deflandre & Cookson). PF-304i(2). 

 Cenomanian (boring depth, 650 feet). Complete specimen showing form of processes. X500 

 (phase contrast). 



Fig. 7. Cleistosphaeridium heteracanthum (Deflandre & Cookson). Cenomanian 

 (boring depth, 840 feet). FM. 840/9. X500. 



Figs. 8-10. Exochosphaeridium phragmites gen. et sp. nov. 8, Cenomanian (boring 

 depth, 810 feet). Apical process and cingular processes present. PF.3043(i). X500. 9, 10 

 Holotype, PF.3035(3). Precingular archaeopyle to the north-west and apical process to the 

 south-west, x 500. 



