ARTICLE XIV. 



Contributions to the Geology of the Tertiary Formations of Virginia. 

 — Second Series — Continued : Being a Description of several Spe- 

 cies of Meiocene and Eocene Shells, not before described. By Wil- 

 liam B. Rogers, Professor of Natural Philosophy in the University 

 of Virginia, and Henry D. Rogers, Professor of Geology and 

 Mineralogy in the University of Pennsylvania... Read March 3, 

 1837. - ■.'■■/ 



Turritella fluxionalis. 



Specific character. — Shell elongated, turrited, whorls about twelve, 

 slightly convex, subcarinated at base, longitudinally striated with five 

 principal hardly granulated revolving striae, the lowest being double, 

 between these are very fine ones, most numerous towards the base of 

 the whorl. Very obtuse nearly obsolete transverse striae give to the 

 principal longitudinal stria a sub-granulated undulation. Aperture 

 sub-quadrangular. Length, one inch and two-tenths. 



Locality, Williamsburg and the neighbourhood, in the meiocene of 

 eastern Virginia. 



Description. —H^his delicately striated shell has two of its finer class 



of lines separating the two stronger threads of the first, or carinal stria, 



about six of them between this and the second, about five between 



the second and third, either two or three between.the third and fourth, 



VI. — 4 s 



