70 Geological Survey of Alabama. 



twisted, thus forming an obtuse fold at some distance from the sharp 

 outer lip ; crenulate within by a few distant elevated spiral lines. 

 Locality. Claiborne, Ala. 



TURBONILLA MlSSISSIPPIENSIS, n. sp. PI. 2, fig. 5. 



Subulate; the sinistral nucleus consists of three smooth convex whorls, 

 which very rapidly increase in size ; its axis is horizontal. Seven con- 

 vex adult whorls are covered with elevated, tran verse ribs, about twelve 

 on each whorl. Suture distinct, aperture oval, base smooth. 



Locality. Red Bluff, Miss. 



Differs from the preceding species mainly by its convex whorls. 



ODOSTOMIA BIDENTATA, n. sp. PL 1, fig. 3. 



Subulate, whorls eight ; nucleus and first whorl smooth, elsewhere fur- 

 nished with transverse ribs ; suture impressed ; base rounded, smooth ; 

 columella with a very prominent oblique fold, and a second indistinct one 

 below it. 



Locality. Claiborne, Ala. 



The ribs have in one of the three specimens 'a tendency to become 

 obsolete, especially toward the lower part of each whorl. The lower fold 

 will be better seen in fragments, with exposed columella, than in a per- 

 fect mouth. 



CHEMNITZIA ACUTA, n. sp. PL 2, fig. 6. 



Whorls eleven, nearly flat ; aperture ovate The ornamentation con- 

 sists of sharp, transverse ribs, crossed by less prominent spiral lines. 

 Each of the four smooth, embryonic whorls is much smaller than the 

 first ornamented whorl, thus forming a pointed nucleus ; suture distinct. 



Locality. Red Bluff, Miss. 



Chemnitzia Claibornensis, Heilpr., sp.,* has the revolving lines not 

 elevated, but impressed ; and the transverse ribs are not sharp lines, but 

 obtuse folds. 



BlTTIUM KCENENI, 11. Sp. PL 2, fig. 12. 



Four spirally striated, embryonic whorls without ribs are followed by 

 four transversely ribbed whorls with three spirals, the uppermost of which 

 is the smallest. On the following older whorls, three more spirals appear 



*Proc. Ac. Nat. Sri., Philadelphia, 1879; p. 214, pi. 13, tig. 11. 



