259 St. Maurich and Clatuorne Pklecypoda 259 



PLATE 58 



Figure f'age 



1-6. Corbula gibbosa Lea, Claiborne 191 



Fig. I, 13 mm. 



2, 9 " 



3, II " 



4, 7 " 



5, II " 



7-10, 12-15. Corbida murchisoni \^&^, Claiborne 191 



Fig. 7, 14 mm. 



8, 14.5 " 



9. II-5 " 

 10, 13 " 

 12, 3 " 



13- II " 

 14, 10 " 



11,16-20. C. iinirchiso)n,\&x./ossaia DaW. Mississippi 193 



Fig. 11,5 mm. 

 16, 7 " 

 17.8 " 



18, broken. 



19, 7 mm. 



20, 4 " 



21-27. Corbula extenuata DaW, Orangeburg Dist I94 



Fig. 21, 4 mm. 



22, 8 " 



23, 5 " 

 24,5 " 



25-27, about 6 mm. each. 



