CONTRIBUTIONS TO CONCHOLOGY.-VOL 3. 

 S ~Y 1ST O IsT TT 1ML TT 



OF THE 



SPECIES 



OP 



STREPOMATIM 



(MELANIANS; 



OF THE UNITED STATES; 



WITH CRITICAL OBSERVATIONS ON THEIR AFFINITIES, 



AND 



DESCRIPTIONS OF LAND, FRESH WATER AND MARINE 



MOLLTJSOA.. 



BY GEORGE W. TRYON, JR., 



MEMBER OP THB ACADEMY OF NATURAL SCIENCES OP PHaADBLPHIA, COBRESPOXDUTO KEMBB* 



OP THE BOSTON SOCIETY OP NATURAL HISTORY, THE HEW YORK LYCECJt OF NATURAL 



HISTORY, THB CALIFORNIA ACADEMY OF NATURAL 8CLBNCE8, 4C. 



NEW YORK: 

 BAILLIERE BROTHERS, 520 BROADWAY. 



LONDON : 

 H. BAILLIERE, 219 REGENT STREET. 



PARIS : 

 J. B. BAILLIERE ET FILS, RUE HAUTEFEUILLE. 



MADRID: 

 C. BAILLY-BAILLIERE, CALLE DEL PRINCIPE. 



