TAB. III. 
Fig 9. Cythereis triplicata. 
a X 
50 
Left valve, outside 
Detritus. 
Charing. 
b X 
50 
Right valve, outside 
53 
c X 
50 
Right valve, inside 
c X 
50 
Right valve, dorsal edge 
33 
d X 
50 
Left valve, inside 
yy 
33 
d' X 
50 
Left valve, dorsal edge 
5? 
?'3 
e X 
50 
Perfect, dorsal aspect 
Gault. 
Folkstone. 
/ X 
50 
Perfect, ventral aspect 
9 X 
50 
Perfect, anterior aspect 
33 
// XlOO 
Punctations . . 
3 J 
Leacon Hill. 
Fig. 10. Cythereis quadrilatera. 
a X 
50 
... 
Adult, left valve, outside 
Gault. 
Folkstone. 
^ X 
50 
Adult, right valve, outside 
33 
33 
c X 
50 
Adult, right valve, inside 
33 
33 
c X 
50 
Adult, right valve, dorsal edge 
33 
33 
X 
50 
Adult, left valve, inside 
33 
33 
d' X 
50 
Adult, left valve, dorsal edge 
33 
33 
e X 
50 
Adult, perfect, dorsal aspect 
5 3 
33 
/ X 
50 
Adult, perfect, ventral aspect 
33 
53 
