358 FOSSIL OSTREID^ OF NORTH AMERICA. 



PLATE XLVI. 



OSTRBA. BARUANDEi Coquand. (Page 292.) 



FlO. 1. — ^Exterior view of the upper valve. For otlier views see Plates XLIV and 

 XLV. 



OSTREA BLACKH White. (Page 292.) 



2. — Exterior view of the under valve. For the opposite view see Plate XLV. 



