.BG2 FOSSIL OSTKElUiE OV NOHTII AMERICA 



PLATE XLVIII. 

 Gryph^a vesiculariS Lamarck. (Pa<;e:!03.) 

 yiGS. 1-5. — Difft rent views of separate valves; natural size. 



OsTREA UNiFORMis Meek. (Page 302.) 

 6, 7. — Two views of the lower valve of M-ek's type specimen ; natural size. 



OsTREA VOMER Morton. (Pago 302.) 

 8-10. — Different views; natural size. 



