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Fig. 1. 



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 5. 

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7. 

 8. 

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 11. 



PLATE V. 



Page 



Ostrea abrupta d'Orb. var.? Valve showing plicated exterior. Venezuela. Cre- 

 taceous. Height 25 mm 40 



Ostrea abrupta d'Orb. var.? Interior of a larger valve. Venezuela. Cretaceous. 



Height 45 mm _ 40 



Ostrea puelchana d'Orb. Small variety. Height 47 mm. Union Estate, Brighton, 



Trinidad. Oligocene 40 



Ostrea puelchana d'Orb. Same shell as 3. Interior of flat valve 40 



Ostrea puelchana d'Orb. Same shell. Interior of convex valve 40 



Ostrea thirsce Gabb. Convex valve. Height 28 mm. Soldado Rock. Lignitic Eocene 39 



Ostrea thirsce Gabb. Same shell, lateral view 39 



Ostrea thirst Gabb. Flat valve. Height 20 mm. Soldado Rock. Lignitic Eocene . . 39 

 Ostrea puelchana d'Orb. Large variety. Height 135 mm. Union Estate, Brighton, 



Trinidad. Oligocene 40 



Ostrea puelchana d'Orb. Same shell, lateral view 40 



Ostrea crenulimarginata Gabb. Smooth and plicated valves. Soldado Rock. Midway 



Eocene 36 





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