PLATE XXX. 
Prcren (continued). 
Figs. 
1,2. P. (Camptonectes ?) gaultinus, Woods. Gault. Woodwardian Museum. 
la, right valve, Folkestone, x 14; 16, portion of the same near 
the postero-dorsal margin x 6. 2, left valve, Black Ven, x 2. 
(P. 163.) 
3—8. P. (Chlamys) fissicosta, Eth. Woodwardian Museum. (P. 163. 
o »  Arlesey. 
3—6. Totternhoe Stone, Burwell. 
Ue 
5 3 » Cherry Hinton. 
3, right valve (type). 4, left valve (type). 5a, right valve; 5b, part of the 
same specimen X 2. 6a, left valve x 14; 66, part of the same near the 
antero-ventral border x 3; 6c, another part near the middle of the valve 
x 3. 7, right valve of a variety with few ribs. 8, left valve, crushed 
near the umbo. 
9—12. P. (Chlamys) Puzosianus, Math. Woodwardian Museum. (P. 165.) 
9. Cenomanian, north of Beer Head. a, left valve; 6, postero-ventral part of the 
same X 2. 
10. Cenomanian, Wilmington. a, left valve ; b, part of the same near the centre x 2. 
11. Same locality. Right valve. 
12. Top of Chloritic Marl, Melbury, North Dorset. Anterior part of right valve 
with the ornamentation well preserved x 2. 
