344 FOSSIL OSTREID^ OF NORTH AMERICA. 



PLATE XXXIX. 



OsTREA pnANKLiNi Coqu.ancl. (Page 296. ) 



Figs. 1, 2. 3. — Views of three different examples; natural size. After Owen. 



OsTKEA ANOMioiDES Meek. (Page 291.) 



4. — Lower valve ; exterior view ; natural size. 

 5. — Similar view of an upper valve. 



OsTREA BELLA Conratl. (Page 292.) 



G. — Upper view ; natural size. After Conrad. 



OsTKEA iDRiDKNsis Gabb. (Page 296.) 



7. — Upper view ; natur.il size. 



8. — Interior view of an under valve. After Gabb. 



OsTUBA APPRESSA Gabb. (Page 291.) 



9. — Upper view ; natural size. After Gabb. 



OsTREA SUBALAIA Meek. (Page 300.) 



10. — Upper view ; natural size. After Meek. 



OsTKEA co.VGESTA Courad. (Page 294.) 



11. — Three small lower valves attached to a fragment of the shell of a large 



Iiioceramus. 

 12, 13. — Interior views of upper valves. After Meek. 



