ERRATA. 

 Page 1, line 9, from bottom, for " Byssandonta," read Byssanodonta. 

 «" 14. " 12, for " castanea," read castaneum. 

 " 14, " 24, for " globosa," read globosum. 



15, " 5, for " Wetumpkaensis," read Wetumpkaense. 



16. " 14, for " Coosa," read Cahawba. 

 16, " 14, for " Wetumpka," read Centreville. 



" 34, " 15, " gracilior," changed to ellipsoides. 

 " 40, " 33, "• propria" changed to lepida. 



