urn 



and sharply toothed ; the hinge pit (or fulcrum) is hroad 

 and curved. The attached valve extends in branching 

 processes upon the surface it is upon. 



In the description of Gryphaea sinuata mention is 

 made of this " bilobed" Oyster, adhering to a specimen 

 of that shell from Folkstone ; there are three attached 

 valves upon that specimen, one of which is represented 

 at fig. 2. of the plate before us. 



Fig. 3. shews the other valve, probably from the same 

 locality. 



We regret that the Oyster from the Isle of Wight, 

 mentioned in the same place, is not perfect enough to 

 determine whether it be the same species ; some dif- 

 ferences are observable, and we have not been so fortu- 

 nate as to meet with another specimen. 



