PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 293 



The area of the shell bed appears to be about one acre. The principal 

 shells are the followin"r : 



Buccinum plicosum. 

 Katica hews. 

 Pecten tcnuicostatmn. 

 Pecten cardium 



Mya arenaria. 

 Mytihis. 

 Helix alternata. 



Vertical section of shell heap, Oak Bay, New Brunswick, September, 1869. 



[Scale I's-] 



Toi) sod, fine powdery humus. 



Much decomposed clam shells. 



Fine flat gravel — Ancient beach. 



Finely comminuted shells: carbonaceous 

 matter. 



Clayey humus, nearly pure. 



Fine shells, white ashes, 

 carbonaceous matter. 



Finely comminuted shells, 

 carbonaceous matter. 



Shells. 



Layer of Echinus spines. 



Black bed. 



Shells. 



Blackish matter. 



Original clay. 



9. 



10. 



11 

 12. 



13. 



