OBSEKVATIONS 



GENUS 11 N I 



DESCIUPTIONS OF x\EW SPECIES, THEIR SOFT PARTS, AxXD EMBRYONIC FORMS, IX 

 THE FAMILY UNIONID.E. 



REAn BEFORE THE AfADEMV OF NATL'RAL SCIENCES OF PHILADELPHIA AND 

 PUBLISHED IN THEIR JOURNAL. 



ISAAC L E A . L L . D 



PBBSIDKST OF THK AIAPKMT f>F NATCKAI. SriFNCE? OK nnLADBLPHIA. ETC 



WITH TWENTY-NINE PLATES. 



vol.. R. 



rn 1 1, A MKi, r II 1 A 

 PKINTF1> Foi; TIIF, AUTHOR. 



