95 



Gould, he remarked, that he had been much struck by the 

 manifest difference of species among shells which, if not 

 placed side by side, might have been easily taken for the 

 same. It had been common to regard deposits from very 

 distant localities and of different geological formations as 

 of the same origin, from their containing fossils thoughtUo 

 be of the same species. The differences indicated by 

 Dr. Gould were of great importance in their bearing on 

 this subject, since they were found among fossil as well as 

 recent shells. 



Mr. Storer presented, in the name of Mr. J. C. Haber- 

 sham, the rattle of a Rattlesnake, from Georgia. 



Dr. Bacon presented, in the name of Mr. Henry Burnett, 

 specimens of crystallized Pyrites and Galena, from the Isth- 

 mus of Tehuantepec. 



The thanks of the Society were voted for the donations. 

 Mr. John Dutton was elected a member of the Society. 



September 17, 1851. 

 Dr. A. A. Gould in the Chair. 



Mr. W. C. Redfield, of New York, present by invitation. 



Mr. Stimpson announced, that he had recently spent a 

 few weeks among the islands at the mouth of the Bay of 

 Fundy, and on the extreme northeast coast of Maine, and 

 he offered the following summary of his observations on 

 the Fauna of that region. 



There are two causes which combine to make the Zoological 



