STANTON I THE MARINE CRETACEOUS INVERTEBRATES. 
EXPLANATION OF PLATE II. 
PAGE 
Ostrea tardensis Stanton .......... II 
Fig. i. Exterior of more strongly curved upper valve. Natural size. 
Fig. 2. Interior of same. 
Note. — This specimen was inadvertently posed with the beak downward. 
(VOL. IV) 
