TAB. I. 



Fig. 1 . Cytliere Hilseana. 



« X 50 Left valve, outside 



3 X 50 Right valve, outside 



c X 50 Riglit valve, inside 



c X 100 Right valve, hinge 



c" X 50 Right valve, dorsal edge 



c"'X 50 Right valve, ventral edge . 



</ X 50 Left valve, inside 



(/'XlOO Left valve, hinge 



^ X 50 Right valve, outside . 



/ XlOO Punctations (of fig. 1 f) 



/■ X 50 Perfect carapace, anterior aspect 



^ X 50 Perfect carapace, dorsal aspect, seen obliquely 



Fig. 2. Cythere piindatula. 



a X 50 Old, perfect, dorsal aspect 



I) X 50 Old, left valve, outside 



c X 50 Immature, right valve, outside . 



(/ X 50 Immature, right valve, inside 



d! X 50 Immature, right valve, dorsal edge 



p X 50 Old, left valve, inside 



e X 50 Old, left valve, dorsal edge 



/ X 50 Young, right valve, outside 



/' X 100 Young, central surface (of fig. 2/) 



g X 100 Immature, central surface . 



h XlOO Immature, central surface 



i XlOO Old, central surface 



j X 50 Worn, perfect, left valve upwards 



k X 50 Immature, perfect, dorsal aspect 



/ X 50 Old, perfect, ventral aspect 



m X 50 Old, perfect, anterior aspect 



n X 50 Var. virginea, perfect carapace, placed 

 obliquely, right valve upwards 



Detritus. Charing. 



Gault. 



Folkstone. 



Detritus. Charing. 



Greensand. 

 Gault. 



Warminster. 

 Folkstone. 



Detritus. 



Greensand. 



Gault. 



Detritus. 



Gault. 



Leacon Hill. 

 Folkstone. 



Charing. 



Warminster. 



Folkstone. 



Charing. 

 Folkstone. 



Chalk. Gravesend. 



