400 FOSSIL OSTREID^ OF NORTH AMERICA. 



PLATE LXVII. 

 OsTREA TAYLORiANA Gabb. (Page 313. ) 

 Figs. 1, 9. — Upper and laterial views; natural size. After Gabb. 

 OsTREA PERCRASSA CoMad. (Page 313.) 

 3. — Interior view of a lower valve. After Conrad. 



