68 



length from one to two inches ; the stria are 

 often bifid ; the gaping part oblong, lateral. 



SPECIES LXVI. Ifnio teres (Elliptic teres.) 



Shell slightly thick, ventricose, elliptical, 

 widened, truncated, inferiorly, posteriorly, and 

 obliquely ; epidermis almost smooth, corneous ; 

 nacre white, iridescent. Length about J- diam. 

 | axis ^ of the breadth ; this species belongs to 

 the sub-genus Eurynia vide page 24. 



Found in the river Wabash ; breadth about 

 three inches ; slightly sinuous inferiorly ; apices 

 eroded ; lamellar tooth long, thin ; cardinal tooth 

 crenulated, decurrent. 



SPECIES LXVII. Obliquaria sinuata (Unio 

 sinuata.) 



Shell thick, ventricose, elliptical, sinuous in- 

 feriorly ; epidermis reddish brown, wrinkled : 

 nacre white, with deep oblique interior furrows. 

 Length diam. i axis j of the breadth. 

 This species belongs to the sub-genus Ellipsaria. 

 Vide page 35, found in the Kentucky breadth 

 four inches ; lamellar tooth thick, oblique, 



