255 St. Maurice and Claibornk Pklkcypoda 255 



PLATE 54 



Figure Page 



I. Spisula decisa Con., 22 -\-va.m.., Claiborne 176 



2-6. S. decisa \a.T. pa hnaris, n. var 176 



Fig. 2, 43 mm., base of Claiborne Bluff. 



3- 37 " 



4, 10+ " Keitt's Ravine, S. C. U. S. Nat. Mus. 



5, .same locality, opposite valve. 



6, 22 X 19 X 6.2, Keitt's Ravine, S. C. U. S. Nat. Mus. 

 7-9. 3Iadropsis (Tquorca Conr&d, Claiborne 177 



Fig. 7, 15 mm. 



8, 14.5 " 



9. 13-5 " 



10-12. Dladropsis rectilincaris Conrad, Claiborne 177 



Fig, 10, 14.5 mm. 

 11,8+ " 

 15, 14 + " 



13, a. Pleropsis papyria Conrad, Claiborne 178 



Fig. 13, 65 mm. ; copy from Conrad. Tj'pe. Phila. Acad. 

 13 a. Photo of a fragment from the posterior portion 

 of the shell, showing minute structure. 



14-15. Pieropsis lapidosa donrad, Orangeburg Dist 178 



Fig. 14, 40 mm. 

 15, 39 " 



