TAB. V. 



Fig. 



1. Ostrea callifera, page 18. 



a. inside view of lower valve. Mus. Jermyn Street. 



b. united valves, umbo inflected in a contrary direction. Mus. Edwards. 



2. Ostrea adlata, p. 16. 



a, b. out and inside views of lower valve. Mus. Edwards. 



c. inside view of upper valve. Mus. Edwards. 



d. inside view of lower valve, abnormal state. Mus. Edwards. 



3. Ostrea marginidentata, p. 27. 



a. inside view of upper valve, showing the altered form of muscle-mark. 



Mus. Edwards. 

 d. inside view of lower valve, with normal form of muscle-mark. This 



specimen had been attached by the entire outer surface. Mus. 



Edwards. 



