TAB. II. 



Fig. 



1. Ostrea edulis, page 13. 



a. specimen with united valves. 



b. outside of lower valve of var. sinuata. 



c. specimen with united valves, var. spectrum. 



2. Ostrea Princeps, p. 17. 



a. outside of lower valve. 



b. ditto of young specimen. 



3. Anomia striata,jo. 11. 



outside of upper or imperforate valve. 



