UNIO VIRIDIS? 
Puate IX,.—F%g. 1. 
DESCRIPTION. 
Shell ovate, thin, inflated over the umbonial slope; 
anterior side slightly compressed; beaks with angu- 
lar transverse ridges; colour ochraceous, with green 
rays; basal margin straight or slightly contracted in 
the middle; cardinal teeth small, compressed, divided 
into three lobes, the posterior lobe situated directly 
under the beaks; lateral teeth much compressed; 
within bluish-white, iridescent. 
Unio — Raf. Monograph of the bivalve 
shells of the river Ohio, &c., p. 19. 
OBSERVATIONS. 
Inhabits Schuylkill river; Juniata river; creeks in 
Lancaster co., Penn., Mr. Hype. Kentucky river, 
Mr. RaFinesQueE. | 
The viridis of Rarinesaue was found in Kentucky, 
and the shell I have described in the Atlantic streams; 
they may therefore be different species, as I have not 
seen a good specimen of the former. I propose in 
that case to call the present shell subviridis. 


