TAB. VII. 



a X 50 

 5 X 50 

 c X 50 

 ^ X 50 

 d' X 50 

 e X 50 

 / X 50 

 y X 50 

 h X 50 

 i X 50 



a X 50 



b X 50 



c X 50 



J X 50 



e X 50 



a X 

 h X 



d X 

 e X 



50 

 50 



c X 50 



50 

 50 



/ X 50 

 ff X 

 h X 

 i X 50 



50 

 50 



Fig. 24. Cytlierella ovata. 

 Adult, left valve, outside 

 Adult, right valve, outside . 

 Adult, right valve, inside 

 Adult, left valve, inside 

 Adult, left valve, dorsal edge 

 Adult, perfect, dorsal aspect 

 Adult, perfect, anterior asjaect, seen obliquely 

 Adult, perfect, transverse section 

 Var., right valve, outside 

 Young, right valve, outside 



Chalk. 



Detritus. 

 Chalk. 



Fig. 25. Cytlierella truncata. 



Adult, perfect, dorsal aspect . . . Detritus. 



Adult, perfect, anterior aspect . . „ 



Adult, perfect, left valve upwards ... „ 



Adult, cast of interior of carapace . Gault. 



. Young, perfect, right valve upwards . . Detritus. 



Fig. 26. Cytlierella Williamsoniana. 

 Adult, perfect, dorsal aspect . . Gault. 



Immature, perfect, dorsal aspect 

 Adult, perfect, ventral aspect 

 Adult, perfect, anterior aspect 

 Immature, left valve, outside 

 Adult, right valve, outside . . . Chalk. 



Adult, right valve, inside . . Gault. 



Young, right valve, outside . 

 Var. granulosa, right valve, outside . Chalk. 



Charing. 



Charing. 



Leacon Hill. 

 Charing. 



Folkstone. 



Detritus. Charing. 



Gravesend. 

 Folkstone. 



Norwich. 



