43 



carinated, striated ; fossule confluent ; cardinal 

 tooth large, striated ; apices truncated. 



SPECIES XXXVI. Obliquaria bullata (Unio 

 bullata.) 



Shell thick, convex, slightly ventricose, with 

 an oblique furrow and sinus posteriorly ; strewed 

 with irregular confluent tubercles ; epidermis 

 reddish brown with flexuous wrinkles distant ; 

 nacre white, flesh coloured. Length f| diam. 

 f axis i of the breadth. 



Found at the falls of Ohio ; rare ; breadth al- 

 most two inches ; cardinal and lamellar teeth 

 like preceding species ; apices rounded, decorti- 

 cated, but not truncated ; tubercles often bleached 

 and worn, flattened, pustulated, of various forms. 



Fourth Sub-Genus ROTUNDARIA. 



Shell rounded, scarcely transversal, almost 

 equilateral ; axis almost medial; ligament curved, 

 short, corneous/ lamellar tooth slightly curved ; 

 cardinal tooth somewhat anterior. 



