211 St. Maukich and Claiborne Pelecypoda» 



PLATE lO 



Fij^ure Page 



i-io. Ostrea vicksburgensis var. ludovidana, n. var 14 



About natural size ; showing form and markings of both 

 valves. Figs. 2 and 6 from Natchitoches, others from Chestnut, 

 La. 



I J- 15. Ostrea johnsoni Aldrich 15 



About natural size. 11-13, Caton's Bluff,Ala. 15, Lisbon, Ala. 



