JVo. 8. 



MONOGRAPHY 



OF THE 



FAMILY UNIONIDiE, 



OR NAIADES OP 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.— PITT SB URGH: JOHN I. KAY & Co.- 



NEW YORK: HALL & VOORHIES, 118 NASSAU STREET.— LONDON: 



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. 



February 1837. 



