257 St. Maurick and Ci.aihounk Pelkcypoda 257 



PI.ATK 56 

 Figure Page 



1-4, 7. Cor/)/i/a snd(ii<rotia/a BiiW, Woods Bluff 185 



Fig. I, 7 mill. 

 2, 7 " 

 3,8 " 

 4,8 " 



7, 7 " 2 and 4 are mates. 



5, 6, 8. The same, var. short, with radii ; Woods Bhiff. 

 Fig. 5, 7 mm. 

 6, 6.5 " 



8, 5-5 " 



9, 10. Corbula alabainiensis Lea, a variety close to what de Gregorio 

 has styled var. ima ; Claiborne sand. 

 Figs. 9 and 10 both 6 mm. in length. 

 II. C. alabainiensis Lea, 11 mm. ; a specimen from Orangeburg 

 Dist., showing a slightly broader form than is usual for 

 this species. 



12, 13. C. alab., var. ciiroiieUa, n. van, Orangeburg Dist 186 



Small posterior development, inflated ; weak umbonal ridge. 

 Fig. 12, 10 mm. 



13, 9-5 " 



14, 15. C alabainensis, max. gregorioi ^ Cossmann, Claiborne 186 



Fig. 14, 14 mm. 



15, II " 



16-26. C. alabainiensis \^it2i, C\A\hox\\^ S2i.\\i\ ; typical 185 



Fig. 16, 9 mm. 



17, II " 



18, II " 



19, 12 " 



20, 16 " 



21, 16.5 " 



22, 19 '■ 



23, 14 " 



24, 19 " 



25, 24 " 



26, 19 " 



27-30. C. alabainiensis, var. leclade Greg., Claiborne 185 



Fig. 27, 14 mm. 



28, 12 " 



29, 16 " 



31-33. Corbula densata Conrad, Jackson Rocene, Miss 185 



Fig. 31, 17 mm. 



32, 18 " 



33, 17 " 



