2G6 AMERICAN JOURNAL 



shell marked by small, closely-arranged longitudinal folds, 

 which, in the larger volutions do not extend to the band, 

 leaving it smooth, with the upper margin elevated ; aperture 

 oblique; columella sub-spiral; anterior canal slightly reflected. 



Dimensions. — Length 145 inches, diameter of body whorl "5 

 inch. 



Locality. — Vicksburg, Miss. Upper Eocene. 



POTAMIDES, Brongniart. 



PoTAMiDES Alabamiensis. — t. 27, f. 13. 



Description. — Shell turrited, consisting of about eight short, 

 strong, rounded volutions ; columella short ; aperture oblique- 

 ly ovate, lower basal portion auger-shaped; entire surface 

 marked by strong, sharply elevated revolving lines, strongest 

 on the middle of the volution; eleven can be counted on the 

 body whorl ; the revolving lines are crossed by faint lines of 

 growth, which have a slight sigmoidal curve. 



Dimensions. — Length of shell 1'12 inches, transverse diam- 

 eter of body whorl '45 inch. 



Locality. — Six miles below Prairie Bluff, Alabama. 



TUEEITELLA EURYNOME. 



Description. — Shell elongate, very gradually tapering; volu- 

 tions flattened; surface marked by four strong, well-defined 

 revolving ridges, with sometimes an intermediate finer one 

 on the middle of the volution; the four ridges are arranged 

 in pairs, with flattened spaces between, the central space 

 wider than the others; the upper carina marks the upper 

 margin of the volution, while the lower one- is as far from the 

 lower margin as the breadth of the space between the upper 

 pair ; under side of volution marked by four or more less dis- 

 tinct ridges; volutions crossed by distinct lines of growth, 

 having a strong retral curvature, embracing the entire surface ; 

 aperture elongate-ovate. 



Locality. — Six miles above Claiborne, Alabama, on the 

 west side of the river. L is'oor, 



TURRITELLA MULTILIRA. 



Description. — Shell of moderate size, extremely elongate, 

 slender; volutions numerous (number unknown), quadrangu- 

 lar, flattened on the surface; upper margin elevated aboVe 

 the preceding volution; aperture rounded; surface marked 

 by numerous very fine iDut distinct revolving striae, crossed 

 by finer lines of growth, having a deep retral curve. 



This species bears some resemblance to T. quadristriata, 

 Rodgers, except in the surface markings. 



Locality. — Six miles below Prairie Bluff, Alabama. 



