TAB. VII. 
Fig. 24. Cytherella ovata. 
a 
X 
50 
Adult, left valve, outside 
Chalk. 
b 
X 
50 
Adult, right valve, outside . 
c 
X 
50 
Adult, right valve, inside 
d 
X 
50 
Adult, left valve, inside 
5 ) 
d' 
X 
50 
Adult, left valve, dorsal edge 
e 
X 
50 
Adult, perfect, dorsal aspect 
5 ^ 
f X 
50 
Adult, perfect, anterior aspect, seen obliquely 
5 ? 
9 
X 
50 
Adult, perfect, transverse section 
h 
X 
50 
Var., right valve, outside 
Detritus. 
Charing. 
i 
X 
50 
Young, right valve, outside 
Chalk. 
Fig. 25. Cytherella truncata. 
a 
X 
50 
Adult, perfect, dorsal aspect . 
Detritus. 
Charing. 
h 
X 
50 
Adult, perfect, anterior aspect 
y> 
c 
X 
50 
Adult, perfect, left valve upwards 
jj 
d X 
50 
Adult, cast of interior of carapace 
Gault. 
Leacon Hill. 
e 
X 
50 
Young, perfect, right valve upwards . 
Detritus. 
Charing. 
Fig. 26. Cytherella Williamsoniana. 
a 
X 
50 
Adult, perfect, dorsal aspect 
Gault. 
Folkstone. 
b 
X 
50 
Immature, perfect, dorsal aspect 
>5 
c 
X 
50 
Adult, perfect, ventral aspect 
d X 
50 
Adult, perfect, anterior aspect 
Detritus. 
Charing. 
e 
X 
50 
Immature, left valve, outside 
f X 
50 
Adult, right valve, outside . 
Chalk. 
Gravesend. 
9 
X 
50 
Adult, right valve, inside 
Gault. 
Folkstone. 
h 
X 
50 
Young, right valve, outside . 
i 
X 
50 
Var. granulosa, right valve, outside 
Chalk. 
Norwich. 
