CONCHOLOGIA CESTRICA. 



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U. ochraceus, SAY, Nich. Encyc., 1st Amer. Ed, 1816. 



Z7. ochraceus. 

 Fig, 184, 



Shell, thin, thicker anteriorly, translucent, pale yel- 

 lowish, or reddish ; radiate with dull green, and with 

 minute wrinkled radii, most observable on the posterior 

 slope ; sub-ovate, hinge margin rectilinear, anterior and 

 lower, rounded, posterior oblique -truncate, angular; 

 beaks undulated ; within bluish ; cardinal teeth double, 

 much compressed, almost horizontal. H. 2, W. 3.5, T. 

 1.5, inches. 



Station, with the preceding. 



U. Tappanianus, LEA, Tr. Amer. Ph. Soct, VI., 1817. 



V. Tappanianus. 

 Pig, 185. 



Shell, thin, sub-oval, rather inflated, elevated back of 



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