338 FOSSIL OSTREID^ OF NORTH AMERICA. 



PLATE XXXVI. 



OSTKEA COALVILLENSIS Meek. (Page 293.) 



Fig. 1.— Exterior view of an upper valve ; natural size. 

 ■i, — Interior view of the same example. 

 3. — Exterior view of a lower valve. 

 4. Interior view of tlio same example. After Meek. 



OsTRicA ELEGANTULA Newberry. (Page 295.) 



5._Exterior view of an upper valve; natural size. 

 6. — Interior view of the same specimen. 

 7. — Exterior view of a lower valve. 



