PLATE 8 



Fig. i. Hystrichosphaeridium bowerbanki sp. nov. Cenomanian (borehole depth, 

 750 feet). FM.75o/2(i). X500. 



Fig. 2. Oligosphaeridium prolixispinosum sp. nov. Cemonanian (borehole depth, 750 

 feet). PF. 3037(2). X500. 



Fig. 3. Oligosphaeridium prolixispinum sp. nov. Holotype, PF.3036(i). X500. 



Fig. 4. Hystrichosphaeridium bowerbanki sp. nov. Holotype, PF.3033(i). X500. 



Fig. 5. Hystrichosphaeridium tubiferum (Ehrenberg). Cenomanian (borehole depth, 

 690 feet). FM. 690/12(1). X500. 



Fig. 6. Hystrichosphaeridum radiculatum sp. nov. Holotype, PF.303i(i). X500. 



Fig. 7. Surculosphaeridium longifurcatum (Firtion). Cenomanian (borehole depth, 

 730 feet). Antapical view. FM. 730/2(1). X500. 



Fig. 8. Polysphaeridium laminaspinosum sp. nov. Holotype, PF.3052(i). X975. 

 (Phase contrast). 



Fig. 9. Callaiosphaeridium asymmetricum (Deflandre & Courteville) . Cenomanian 

 (boring depth, 840 feet). Medial view in focus to show 6 large tubular cingular processes. 

 FM. 840/6(1). X500. 



Fig. 10. Antapical view of same showing 5 postcingular processes. X500. 



Fig. 11. Surculosphaeridium longifurcatum (Firtion) PF.3042(i) Cenomanian (boring 

 depth, 840 feet). Lateral view showing 3 series of processes — precingular, cingular and post- 

 cingular. X500. 



