410 FOSSIL OSTREID^ OF NORTH AMERICA. 



PLATE LXXII. 

 OSTREA VEATCHil Gabb. (Page 316.) 

 Fig. 1.— Exterior view of a lower valve. After Gabb. 



OsTKEA CERROSENSis (Raiinoudi) Gabb. (Page 315.) 

 2. — Exterior view of an iijiper valve. After Gabb. 



OsTREA LURIDA Carpenter. (Page 316.) 

 Figs. 3, 4. — Exterior aud interior views of a lower valve; natural size. 



