TAB. II. 



Fig. 

 1. Ostrea edulis, pc/^e 13. 



a. specimen with united valves. 



L outside of lower valve of var. sinuata. 



r. specimen with united valves, var. sjicctnim. 



• 2. Ostrea Princeps, /^. 17. 



a. outside of lower valve. 

 6. ditto of young specimen. 



3. Anomia striata, /j. 11. 



outside of upper or imperfora te valve. 



