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"I 

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CONTRIBUTIONS TO CONCHOLOGY.-VOL 3. 



OP THE 



SPECIES 



OP 



STREPOMATIM 



(MELANIANSJ 



OF THE UNITED STATES; 



WITH CRITICAL OBSERVATIONS ON THEIR AFFINITIES, 



AND 



DESCRIPTIONS OF LAND, FRESH WATER AND MARINE 



MOLLTJSOA.. 



BY GEORGE W. TRYON, JR., 



XBMBER OF THB ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA, CORRESPONDING MEMBER 



OF THE BOSTON SOCIETY OF NATURAL HISTORY, THE HEW YORK LYCEUM OF NATURAL. 



HISTORY, THB CALIFORNIA ACADEMY OF NATURAL SCIENCES, 4C. 



NEW YORK: 

 BAILLIERE BROTHERS, 520 BROADWAY. 



LONDON : 

 H. BAILLIERE, 219 REGENT STREET. 



PARIS : 

 J. B. BAILLIERE ET FILS, RUE HAUTEPEtriLLB. 



MADRID: 

 C. BAILLT-BAILLIERE, CALLE DEL PRINCIPE. 



