TAB. III. 



Fig 9. Cytliereis triplicata. 



« X 50 Left valve, outside 



<5 X 50 Right valve, outside . 



c X 50 Right valve, inside 



c X 50 Right valve, dorsal edge 



</ X 50 Left valve, inside 



^' X 50 Left valve, dorsal edge 



e X 50 Perfect, dorsal aspect 



/ X 50 Perfect, ventral aspect 



y X 50 Perfect, anterior aspect 



h X 100 Punctations 



Fig. 10. Cytliereis quadrilatera 



a X 50 Adult, left valve, outside 



b X 50 Adult, right valve, outside 



c X 50 Adult, right valve, inside 



c X 50 Adult, right valve, dorsal edge 



G? X 50 Adult, left valve, inside 



d' X 50 Adult, left valve, dorsal edge 



e X 50 Adult, perfect, dorsal aspect 



/ X 50 Adult, perfect, ventral aspect 



Detritus. Charing. 



J5 



Gault. 



Gault. 



Folkstone. 



Leacon Hill. 



Folkstone. 



