CONCHOLOGIA CESTRICA. 99 
Station, Brandywine Creek, Schuylkill River, Chester 
County ; abundant. 
S. stamineum, CONRAD. 
Cyclas stamineum, Conrad, Amer. Jour., XXV., 1834. 
S. stamineum, — [Prime. ] 
Fig, 199. 

Shell, stout, oval, full, anterior side abrupt, posterior 
more distended; beaks very full, and prominent, distant; 
dark brownish-yellow ; interior bluish; strongly striate; 
hinge margin curved; cardinal teeth nearly obsolete ; 
laterals strone.. Hoyo, W 14, T: 7, mill. 
Station, tributaries of the Delaware River. 
S. fabalis, PRIME. 
Cyclas fabalis, Prime, Bost. Proc., IV., 1851. 
S. fabalis. — [Prime.] 
Fig, 200. 

Shell, transversely oval, almost equilateral, rounded, 
posterior side rather abrupt ; beaks depressed, regularly 
and moderately sulcated; epidermis, greenish, or straw 
color; valves thin, blue within; cardinal teeth small; 
laterals slight, the anterior more elevated, both nearly 
on a line with the cardinals. H. 11, W. 14, T. 6, mill. 
Station, Susquehanna River and tributaries. Lan- 
caster County; not common. 
