TAB. IV. 



Fig. 

 1. Ostrea tabulata, page 31. 



a. outside view, upper valve, from Bognor. Mus. Edwards. 



b. outside view, lower valve, „ Mus. Jermyn Street. 



2 a. outside view of the upper valve of an oyster from Clarendon, with greatly 

 incurved umbo like Exogyra ; supposed to be the young state of 0. pulchra. 

 Mus. Edwards. 



2 b. inside of another specimen, with margin denticulated near the hinge, same 

 locality, supposed also to be the young state of O. pulchra. Mus. 

 Edwards. 



3. Ostrea flabellula juv. ? page 21. 



From Barton. Mus. Edwards. 



