With seven whorls; body whorl more flattened than in the preceding 

 species; Ohio River area 



Campeloma suhsolidum (Anthony) 

 (Campeloma crassulum Raf.) 



64. Lower edge of aperture more or less narrowed or slightly drawn out 



to a blunt point, in most species; shell often dark-banded within; 

 usually heavy and getting to be over one-half an inch high; several 

 genera and many species, most of them south of the Ohio River, but 

 some farther north and west, and a few species of the genus Gonio^ 

 basis on the west coast; a large and variable group, with genera and 

 species intergrading; Family Pleuroceridae 65. 



Aperture broadly rounded below; shell usually plain colored; usually 

 solid to thin and less than one-half an inch high 76. 



65. With a gap in the upper rim of the aperture along the suture; found 



in the Coosa River, Alabama 



Gyrotoma amplum Anthony Cut-lip Shell 

 {Schizostoma ampla (Anthony) ) 

 Aperture complete above 66. 



66. Lower edge of aperture produced into a long, narrow half -tube; shell 



often spinous or tuberculate 



lo fluviahs (Say) Spindle Shell 

 (Includes lo spmosus Lea) 

 Aperture not so much drawn out; shell smooth or rough 67. 



67. Columellar area of aperture heavily calloused; aperture slightly longer 



than the spire in most species 68. 



Columellar area slightly thickened ; spire somewhat longer than the aper' 



ture in most species — Steeple Shells 74. 



68. Aperture drawn out but scarcely narrowed below; body whorl smooth 



to ridged or faintly tuberculate 69. 



Aperture narrowed below; body whorl smooth to tuberculate 70. 



69. Many species of the genus Anculosa. A few species have been referred 



to the genus Klitocris on the basis of difference in number and arrange 

 mcnt of teeth of the radula. Shells vary greatly in sculpture according 

 to locality. Two representative species are given. 



Anculosa praerosa (Say) 

 and 



l^itocris carinata (Brug.) 



70. Columellar extremity of lip turned sharply inward below 71. 

 Columellar extremity of lip slightly incurved below 72. 



7 1 . Inner edge of lip folded back over a deep umbilical area 



Eurycaelon anthonyi (Budd) 

 With a callus over the umbilical area 



Eurycaelon crassa (Haldeman) 



72. Aperture well produced below; body whorl usually with a central row 



of tubercles 



Lithasia armxgera (Say) 

 (Angitrema armigera (Say) ) 



122 



