368 FOSSIL OSTREID^ OF NORTH AMERICA. 



PLATE LI. 

 ExoGYRA TEXANA Roemer. (Page 306.) 



Figs. 1, 2, 3.— Upper, under, and lateral views of a nearly adult example ; natural size. 

 4,5. — Interior views of the under and upper valves of the same example. 

 After Rojmer. 



