TAB. II. 
Fig. 3. Cythere umhonata. 
a X 
50 
Perfect, dorsal aspect . 
Detritus. 
Charing. 
h X 
50 
Perfect, ventral aspect 
5) 
3 3 
c X 
50 
Young’, perfect, ventral aspect 
5? 
33 
d X 
50 
Perfect, posterior aspect 
3 J 
33 
e X 
50 
Perfect, placed obliquely, left valve upwards 
>3 
33 
e X 100 
Punctations (of fig. 3 (?) 
? 3 
33 
/ X 
50 
Right valve, outside 
33 
33 
// X 
50 
Left valve, inside 
Fig. 4. Cythere Faba. 
33 
3 3 
a X 
50 
Perfect, right valve upwards 
Detritus. 
Charing. 
h X 
50 
Perfect, dorsal aspect 
33 
33 
c X 
50 
Perfect, anterior aspect 
Fig. 5. Cythere Baird, iana. 
33 
33 
a X 
50 
Right valve, inside 
Greensand. 
Farringdon. 
h X 
50 
Right valve, dorsal edge 
33 
33 
c X 
50 
Right valve, anterior aspect 
Fig. 6. Cythereis interrupta. 
3 3 
33 
a X 
50 
Left valve, outside 
Detritus. 
Charing. 
X 
50 
Perfect, dorsal aspect . 
33 
55 
XlOO 
Punctations . . . . 
33 
35 
h X 
50 
Var. o, left valve, outside 
Gault. 
Leacon Hill 
/ X 
50 
Var. a, perfect, ventral aspect 
35 
33 
C X 
50 
Var. j3, left valve, outside 
33 
Folkstone. 
d X 
50 
Var. (3, right valve, inside 
33 
33 
.9 X 
50 
Var. j3, perfect, anterior aspect 
Fig. 7. Cythereis Galtina. 
33 
35 
a X 
50 
Right valve, outside 
Gault. 
Folkstone. 
^ X 
50 
Left valve, inside 
35 
33 
c- X 
50 
Left valve, dorsal edge 
Fig. 8. Cythereis macrophthalma. 
33 
33 
« X 
50 
Left valve, outside 
Chalk. 
Norwich. 
a' X 
50 
Left valve, inside 
3 3 
33 
«"X 
50 
Left valve, dorsal edge 
53 
33 
X 
50 
Right valve, outside 
33 
33 
^'x 
50 
Right valve, inside 
33 
33 
h"X 
50 
Right valve, dorsal edge 
33 
33 
h"'X 
50 
Right valve, anterior edge 
33 
53 
