PLATE XXXI. 
Prcren (continued). 
Fias. 
1,2. P. (Chlamys) britannicus, Woods. (P. 167.) 
1. Dr. Blackmore's Collection. Upper part of M. cor-anguinum zone, Stratford, 
near Salisbury. a, part of valve; 6b, same x 4. 
2. Mr. G. E. Dibley’s Collection. MM. cor-anguinum zone, Haling Pit, South 
Croydon. a, left valve; b, part of the same x 3. 
6. P. (Chlamys) Milleri, Sow. Greensand, Blackdown. Woodwardian Museum. 
(Pe 168%) 
ray 
o 
Meyer Collection. a, left valve; b, part of the same near the umbo x 6. 
4. Wiltshire Collection. a, right valve x 2. The anterior ear is drawn from 
oo 
another specimen in the same collection. 
5. Wiltshire Collection. Right valve. Ornamentation just above the middle of 
the valve x 6. 
6. Meyer Collection. a, left valve; 6b, postero-ventral part of the same x 3. 
7—9. P. (Chlamys) subacutus, Lam. (P. 169.) 
7, 9. Meyer Collection. Bed 11 (Cenomanian), Dunscombe. 7a, right valve; 
7b, part of same x 3. 9, ribs of another right valve near the middle of the 
valve x 3. 
8. Museum of Practical Geology, No. 6683. Greensand, Haldon. a, right valve; 
b, part of same in the middle of the dorsal third x 4; c, part near middle of 
ventral border x 4. 
10—13. P. (Chlamys) elongatus, Lam. Woodwardian Museum. (P. 170.) 
10, 11. Wiltshire Collection. Gault, Folkestone. 10, left valve. lla, left valve; 
11}, part of same X 3. 
12. Wiltshire Collection, Chalk Marl, Ventnor. a, left valve; b, postero-ventral 
part of same x 2. 
13. Totternhoe Stone, Arlesey. Right valve. Ribs near the middle of the ventral 
border x 4. 
