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Part 4. 



AMERICAN 

 JOURNAL 



CONCmOLOGY, 



1871-72. 



PUBLICATION COMMITTEE : 



GEORGE W. TRYON, Jr., Editor, 



S. R. ROBERTS, 



E.J. NOLAN, M. D. 



PHILADELPHIA : 



Published by 



The Gonchologioal Section or the Academy op Natural Scibncbs, 



N. W. corner of Broad and Sansom Streets. 



NEW YORK : LONDON : 



B. Westermann & Co., # No. 440 Broadway. Trubner & Co., No. 60 Paternoster Row. 



BERLIN: 



Asher & Co. No. 20 Unter d. Linden. 



Merrlhew ft Son. Prs. No. 135 N. Third St. 



