OP CONCHOLOQY. 265 



Locality. — Six miles below Prairie Bluff, Alabama. . ^ 



Natica ((3^iVoc?e5)- Alabamiensis. — t. 27, f. 9, 10. ^■/f'^ J-^^^/n^ 



Description. — Shell oblique subspatulose ; spire elevated; (^ • * 

 volutions four, flattened on top; aperture large, broadly sub- Soua-I 

 ovate; columella flattened, and slightly grooved; umbilicus ' 



minute, or none; surface marked by fine, wavy revolving 

 lines, strongest near the upper part of the volution, crossed 

 by distinct lines of growth. 



Dimensions. — Length "80 inch, width '62 inch. 



Locality. — Six miles above Claiborne, Alabama, west side 

 of the river. 



NaTICA (Girodes) APERTA. 



Description. — Shell very oblique, patulose; spire low; volu- 

 tions three, slightly flattened on the top, with a depression 

 just below, and sharply rounded on the lower part; umbilicus 

 very large; upper part of the columellar lip reflected over 

 the umbilicus; callus none; aperture large, semi-lunate; sur- 

 face marked by lines of growth. 



Locality. — Six miles above Claiborne, Alabama. 



VELUTINA, Fleming. fj^^ ^ -U''t^^fc,d 



Yelutina {Otina) expansa. — t. 27, f. 14, 15. ^'l- 'u (^v. 2., t. y^ 



Description. — Shell minute, broadly expanded; spire very 

 low; volutions from two to three, the outer one forming the 

 greater part of the shell; peristome continuing around the 

 body of the volution to near the base of the columella; mar- 

 gin of the aperture flattened or slightly reflected: inner sur- 

 face of shell highly polished; exterior marked by irregular 

 lines of growth. 



The different individuals differ somewhat in the degree of 

 expansion of the outer volution. 



Dimensions. — The largest individual seen, measures '05 inch 

 across the aperture. 



Locality. — Six miles below Prairie Bluff, Alabama, in sand, 

 filling the cavities of other shells. 



CERITHIUM, Adanson. 



Cerithium vinctum. — t. 27, f. 8. 



Description.— '^heW regularly elongate, conical; volutions 

 ten or more; flattened above, ventricose below, and becoming 

 gibbous or irregularly contracted in the last volution of adult 

 specimens, and ornamented by a revolving band, which occu- 

 pies the lower half of the exposed part; upper part of the 



