202 Bur^ivKTiN 31 203 



EXPLANATION OF PLATES 



Note. — Unless some statement is made to the contrary, it may be as- 

 sumed that the specimens from which these illustrations were made are now 

 deposited in the Paleontological Laboratory at Cornell University. 



PI.ATE I 

 Figure Page 



Ostrea alabamiensis Lea 8 



Adult from Claiborne, Ala. ; X % . This is the form labelled by Con- 

 rad, "(9. claibornensis Con.", in the Philadelphia Academy Collection. 



