58 



This is one of the handsomest shells produced 

 in the Ohio ; rare in that river, but less so in the 

 tributaries of the Kentucky, &c. it attains al- 

 most six inches in length ; nacre tinted with 

 flesh colour, with changes of violet ; produces 

 pearls ; I have seen one of these which was of 

 an oblong form, measuring a quarter of an inch 

 in length.* Apices oblique, wrinkled, entire ; 

 lamellar tooth long, broad, sharp, compressed, 

 slightly oblique ; no fossule ; cardinal tooth 

 striated inferiorly. Interior borders undulated ; 

 animal yellow. 



THIRD SUB-FAMILY Anodontidea. 



Shell transverse, neither cardinal nor lamellar 

 teeth. 



Ninth Genus ANODONTA. 



Shell elliptical or oval ; ligament straight, or 

 curved ; axis extramedial ; three muscular im- 

 pressions, slightly apparent ; contour somewhat 



* A highly respectable friend, and zealous conchologist, 

 (JAMES S. CRAFT, Esq. of Pittsburg, Pa.) possesses a pearl, 

 that is very little inferior in lustre and beauty to the ori- 

 ental product ; he obtained it from one of the Ohio Unios. 

 TRANS. 



