JVo. 7. 



MONOGRAPHY 



OF THE 







FAMILY UNIONID^, 



OR NAIADES OF LAMARCK, 

 (FRESH WATER BIVALVE SHELLS,) 



OF 



NORTH AMERICA, 



ILLUSTRATED BY FIGURES DRAWN ON STONE FROM NATURE. 



BY T. A. CONRAD, 



CURATOR OF THE ACADEMY OP NATURAL SCIENCES OF PHILADELPHIA, HONORARY MEMBER OF 

 THE GEOLOGICAL SOCIETY OF PENNSYLVANIA. 



PHILADELPHIA: 



J. DOBSON, 108 CHESNUT STREET. 



BOSTON: PERKINS & MARVIN.— PITTSB URGH: JOHN I. KAY & Co.- 



NEW YORK: HALL & VOORHIES, 118 NASSAU STREET.-ZOA^OA 



O. RICH, No. 12, RED LION SQUARE.— PARIS: ARTHUS 



BERTRAND, FILS, RUE HAUTEFEUILLE No. 23 — 



HAMBURGH: PERTHES & BESSER, 



No. 22, AM JUNGFERNSTIEG. 



E. G. DORSEY, PRINTER. 



December 1836. 



