JWo. 9. 



™ 



F/5 



MONOGR APHY 



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 OP PHILADELPHIA, HONORARY MEMBER OF 

 THE GEOLOGICAL SOCIETY OF PENNSYLVANIA. 



PHILADELPHIA: 



J. DOBSON, 108 CHESNUT STREET. 



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



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



O. RICH, No. 12, RED LION SQ.VKS.E.— PARIS: ARTHUS 



BERTRAND, FILS, RUE HAUTEFEUILLE No. 23.— 



HAMBURGH: PERTHES & BESSER, 



No. 22, AM JUNGFERNSTIEG. 



E. G. DORSEY, PRINTER. 



March 1837. 



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& 



