CONTENTS 



Plate I. Unio ovatus. 

 „ II. ,, fasciatus. 



III. 



S clava. 

 ( decisus. 



jy 5 reflexus. 



" \ flexuosus. 



Y ( phillipsii. 



" I nietaneovus. 



Note.— Several species were noticed in the prospectus, which we 

 have omitted in this number, in order to figure others supposed to be 

 new. 





