PLATE 9 



Fig. i. Cleistosphaeridium ancoriferum (Cookson & Eisenack). Cenomanian (boring 

 depth, 690 feet). Detached 6-sided apical region. FM. 690/4(1). X1250. (Phase contrast). 



Fig. 2. Callaiosphaeridium asymmetricum (Deflandre & Courteville) . Speeton Clay 

 (at 10-325 metres depth). ¥.51716(2). X500. 



Fig. 3. Hystrichosphaeridium simplicispinum sp. nov. ¥.51729(2). X500. 



Fig. 4. Oligosphaeridium macrotubulum (Neale & Sarjeant). Holotype, ¥.51712(2). 

 X400. 



Fig. 5. Hystrichosphaeridium arborispinum sp. nov. Speeton Clay (at 42 5 feet 

 depth). ¥.51719(3). X500. 



Fig. 6. Surculosphaeridium cribrotubiferum (Sarjeant). Holotype, ¥.51735(1). x 500. 



Fig. 7. Oligosphaeridium vasiformum (Neale & Sarjeant). Holotype, ¥.51709(1). 

 X400. 



Fig. 8. Surculosphaeridium vestitum (Deflandre). ¥.51736(1). X500. 



Fig. 9. Hystrichosphaera sp. ¥.51724(1). X500. 



Fig. 10. Hystrichosphaeridium arborispinum sp.nov. Holotype, ¥.51727(3). Lateral 

 view. X500. 



Fig. 11. Achomosphaera neptuni (Eisenack). ¥.51717(1). Precingular archaeopyle to 

 the north. X500. 



