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Published at $10 per Annum— Payable in Advance. 

 Vol. 7. Part 3. 



AMERICAN 



JOURNAL 



CONCHOLOGY, 



1871-72. 



PUBLICATION COMMITTEE : 



GEORGE W. TRYON, Jr., Editor, 



S. R. R03ERTS, 



E. J. NOLAN, M. D. 



PHILADELPHIA : 



Published by 



Thk Oonghological Section of the Academy op Natural Sciences, 



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