TAB. III. 



Fig. 



1. Ostrea Bellovacina, page 17. 



a. outside view of upper valve from Charlton. Mus. Edwards. 

 h. outside view of lower valve „ „ 



2. Ostrea cymbuloides,/;. 20. 



From Heme Bay. Mus. Bowerbank. 



3. Ostrea prona, p. 29. 



From Brockenhurst. Mus. Edwards. 



4. Ostrea flabellula, p. 21. 



a. outside, normal form, from Bramshaw. Mus. Edwards. 

 d. outside, abnormal form, from Barton. „ 





