174 A NATURE WOOING. 



25. Modiola plicatula Lam. This sea "mussel" was 



represented by a few broken valves in each 

 of the Donax layers. It occurs along the 

 Atlantic coast from Nova Scotia to Georgia. 



26. Ostrea virginica Gmel. A number of isolated 



deposits of the valves of the common oyster 

 were found in the upper two layers of the 

 mound ; but none in any of the lower layers. 

 This is strange when taken in connection with 

 the facts that this oyster is common in the 

 Halifax River, and that, according to the ex- 

 tract by Wyman, already quoted, the large 

 mounds along the coast to the south are com- 

 posed mostly of the shells of oysters. 



27. Pecten dislocatus Say. Professor Hitchcock 



found a number of valves of this marine f onn 

 scattered among the layers of Donax. It is at 

 present abundant from Cape Halt-eras to the 

 straits of Florida. 



28. Anomia simplex Orbig. A few valves were 



found in all the layers, but it was more com- 

 mon in the lower ones. It occurs along the 

 entire Atlantic coast. 



Besides the above named shells, the remains of a 

 barnacle, Balanus sp. ? occur occasionally in most, if 

 not all, of the shell layers of the mound. 



A number of bones and fragments of bones from 

 the different layers of the mound were taken home 

 with me and submitted to Dr. O. P. Hay, of the 



