18 



FIFTEENTH REPORT ON THE CABINET OF NAT. HISTORY. 



Unio sowerbyanus 



Lea 



Tennessee. 



SPARSUS 



Lea 



Tennessee. 



SPATULATUS 



Lea 



Michigan. 



SPISSUS 



Lea 





SPLENDIDUS 



Lea 



Georgia. 



STEWARDSOnll 



Lea 



Tennessee. 



STRAMINEUS 



Conrad 



Alabama. 



STRIATUS 



Rafinesque 



Ohio. 



SUBANGULATUS 



Lea 



Georgia. 



SUBGIBBOSUS 



Lea 



Alabama. 



SUBPLANUS 



Conrad 



Virginia. 



SUBROSTRATUS 



Say 



Ohio. 



SUBTENTUS 



Say 



Tennessee. 



SULCATUS 



Lea 



Ohio. 



T^NIATUS 



Conrad 



Tennessee. 



TARSUS 



Rafinesque 



Ohio. 



TERES 



Rafinesque 



Ohio. 



TRAPEZOIDES 



Lea 



Louisiana. 



TORTUOSUS 



Lea 



Georgia. 



TRIANGULARIS 



Barnes 



Ohio. 



TRIGONUS 



Lea 



Ohio. 



TROOSTIENSIS 



Lea 



Tennessee. 



TRUNCATUS 



Rafinesque 



Ohio. 



TUBERCULATUS 



Rafinesque 



Ohio. 



TURGIDULUS 



Lea 



Tennessee. 



TURGIDUS 



Lea 



Mississippi. 



UNBATUS 



Barnes 



Ohio. 



VANUXEMENIANUS 



Lea 



Tennessee. 



VERECUNDUS 



Gould 



East Indies. 



VERRUCOSA 



Reeve 





VERRUCOSUS 



Rafinesque 



Ohio. 



VIRIDIS 



Rafinesque 



North-Carolina. 



Alasmodon ambigua 



Say 



Ohio. 



BONELLII 



Ferussac 



Europe. 



CALCEOLA 



Lea 



Ohio. 



complanata 



Barnes 



Ohio. 



COSTATA 



Rafinesque 



Ohio. 



DELTOIDEA 



Lea 



Ohio. 



EDENTULA 



Say 



Ohio. 



ELLIOTTI 



Lea 



Georgia. 



ETOWAHENSIS 



Conrad 



Georgia. 



FABULA 



Lea 



Virginia. 



IMPRESSA 



Anthony 





MARGINATA 



Say 



North-Carolina, 



TRIANGULATA 



Lea 



Georgia. 



TRUNCATA 



Suj 



Ohio. 



UNDULATA 



Say 



Maryland. 



