98 CONCHOLOGIA CESTRICA. 



S. simile, SAY. 



Cyclas similis, Say, Nich. Encyc., Ed. I., 1816. 



S. similis. [Prime.] 

 Fig, 197. 



Shell, transverse-oval, more pointed posteriorly, base 

 slightly curved; beaks full, elevated; sulcate, dark 

 chestnut; inside bluish; cardinal teeth small, indistinct; 

 lateral teeth on a line with the primaries, large, promi- 

 nent. H. n, W. 17, T. 8, mill. 



Station, running streams. Pickering Creek, Chester 

 County; common. 



S. striatinum, LAM. 



Cyclas striatinum, Lam., An. S. Vert, V., 1818. 



S, striatinum. [Prime.] 

 Pig, 198, 



Shell, thin, inequilateral, rounded anteriorly, posteri- 

 orly elongated; sulcations slight, or irregular; color 

 light or darker shades of green; interior blue; hinge 

 margin curved ; cardinal teeth very small, lateral larger, 

 not prominent. H. 8, W. 11, T. 6, mill. 



