62 



Ostrea. Placuna. 



Trib. 2. Placentadee. 



Placenta Oa Costa. (Placuna Sol. Ch.) 

 Epliippium Bolt. (Sellaria Link ) 



785 3 sella Gm. Ind. or. 



Otsrea ephippium Houttyn.Meusch. 

 Ephip. anglicanum maximum Ch. 8f. 714. 

 Placenta ephippium Retz. 

 E. polonicum Bolt. 

 Placenta Da Costa. 



786 2 orbicularis Retz. Ind. or. 



Anomia placenta L. 



