TAB. VI. 
Fig. 17. Bairdia Harrisiana. 
a 
X 
50 
Perfect, dorsal aspect 
Detritus. 
Charing. 
h 
X 
50 
Perfect, anterior aspect 
>3 
33 
c 
X 
50 
Perfect, left valve upwards ... 
33 
33 
d 
X 
50 
Right valve, outside 
33 
33 
e 
X 
50 
Right valve, inside 
Chalk. 
Charlton. 
/ X 
,50 
Left valve, inside 
33 
33 
Fig. 18. Bairdia angusta. 
a 
X 
50 
Perfect, dorsal aspect 
Gault. 
Folkstone. 
h 
X 
50 
Perfect, anterior aspect 
33 
33 
c 
X 
50 
Perfect, placed obliquely, right valve upwards 
Detritus. 
Charing. 
d 
X 
50 
Perfect, left valve upwards . 
Gault. 
Folkstone. 
e 
X 
50 
Right valve, inside 
33 
33 
e 
X 
50 
Right valve, ventral edge . . . 
35 
33 
f X 
50 
Left valve, inside 
53 
33 
/ XlOO 
Left valve, hinge-margin (of fig. 18/) 
33 
33 
Fig. 19. Bairdia triquetra. 
a 
X 
50 
Left valve, outside 
Chalk. 
Gravesend. 
b 
X 
50 
Left valve, dorsal edge 
33 
33 
c 
X 
50 
Left valve, anterior aspect 
33 
33 
Fig. 20. Bairdia Silicula. 
a 
X 
50 
Left valve, inside 
Detritus. 
Charing. 
h 
X 
50 
Left valve, dorsal edge 
33 
33 
c 
X 
50 
Left valve, anterior aspect . 
33 
35 
Fig. 2 1 . Cytlierella (?) appendieulata. 
a 
X 
50 
Right (?) valve, outside 
Gault. 
Folkstone. 
b 
X 
50 
Perfect, dorsal aspect 
55 
33 
Fig. 22. Cytherella (?) Mantelliana. 
a 
X 
50 
Perfect, left valve upwards 
Detritus. 
Charing. 
b 
X 
50 
Perfect, dorsal aspect 
33 
33 
c 
X 
50 
Perfect, anterior aspect 
33 
33 
Fig. 23. Cytherella (?) Bosquetiana. 
a 
X 
50 
Perfect, right valve upwards 
Detritus. 
Charing. 
b 
X 
50 
Perfect, dorsal aspect 
33 
33 
c 
X 
50 
Left valve, anterior aspect . 
33 
33 
