94 CONCHOLOGIA CESTRICA, 
A. fluviatilis, DILLWIn. 
Mytilus fluviatilis, Dillwin, Descr. Cat. Shells, 1817. 
Anodon fluviatilis. 
Fig. 192. 



Shell, thin, fragile, oblong-ovate, ventricose ; epider- 
mis olive-brown, rayed with green; hinge margin ele- 
vated; beaks at the anterior third of the length; nacre 
bluish-white. H. 2.75, W. 5, T. 2, inches. 
Station, in all the larger streams, especially in mill- 
dams. Chester County; abundant. 
A. implicata, Say, New Harm. Dis., II., 1829. 
A, implicata, 
Fig, 193, 
SSN 
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