PLATE ii 



Fig. i. Polysphaeridium subtile gen. et sp. nov. Holotype, ¥.51752(1). X850. 



Fig. 2. Cordosphaeridium exilimurum sp. nov. London Clay (275 feet above base of 

 London Clay) ; Whitecliff Bay. Archaeopyle well shown. ¥.51749(1). X425. 



Fig. 3. Hystrichosphaeridium sheppeyense sp. nov. Holotype, ¥.51741(1). X850. 



Fig. 4. Cordosphaeridium gracilis (Eisenack). London Clay (731 feet above base of 

 London Clay) ; Sheppey. Detached apical plate. Sh. 5/1(1). X450. 



Fig. 5. Oligosphaeridium pulcherrimum (Deflandre & Cookson). ¥.51742(1). Oper- 

 culum only slightly displaced and bearing 4 apical processes. 



Fig. 6. Cordosphaeridium gracilis (Eisenack). London Clay (173 feet above base of 

 London Clay) ; Sheppey. Haplotabular archaeopyle well shown. ¥.51746(3). X400. 



Fig. 7. Cordosphaeridium gracilis (Eisenack). London Clay (173 feet above base of 

 London Clay); Sheppey. Detached apical plate showing characteristic shape. Sh.5/i(2). 

 X450. 



Fig. 8. Perisseiasphaeridium pannosum genet sp. nov. Holotype, ¥.51743(1). X500. 



Fig. 9. Cleistosphaeridium disjunction sp. nov. Holotype, ¥.51739(2). X400. 



