20 BULLETIX I I aO 



"Habite— Fossile de Parnes. Cabinet de M. Def ranee. Long- 

 ueur, pres de 14 millimetres." 



P. terebalis from its t3'pical locality differs from our specimens 

 by having a somewhat longer canal in proportion to the height 

 of the spire, has finer striations and crenulations, and is not so 

 bi-carinate on the body whorl. F. E. Edwards however found 

 ( Paleont. Soc. vol. xxi, p. 233, pi. xxvii, figs. 10 a — k. ) that 

 the lower Eocene of England contained many varieties of this 

 species and to them he gave six varietal names. Deshayes says 

 in his An. Sans. Vert., vol. 3, p. 359, 1864: ''Cette belle espece 

 est beaucoup plus variable que nous ne nous I'etions imagine 

 lorsque nous I'avons decrite dans notre premier ouvrage; quelques 

 varietes existent dans le calcaire grossier, mais les plus nom- 

 breuses et les plus singulieres se montrent dans les sables infe- 

 rieurs. ' ' 



In both Old and New world representatives of this species the 

 specimens from lower Lignitic horizons ( Sables inferieurs ) are 

 less finely crenulate than their middle or upper Eocene posterity. 



Lignitic localities. — Ala.: Gregg's landing, Woods bluff, 3 

 miles S. W. of Thomasville. 



Specimen figured. — Paleont. Mus., Cornell University. 

 Pleurotoma tombigbeensis, PI. 2, fig. 12, a. 



Syn. P. tombigbeensis Aid., Bull, i, Geol. Surv. Ala., 18S6, p. 30, pi. 3, 

 fig. 10. 



Aldrich'' s original description. — "Shell large, rather thick and 

 solid, fusiform; whorls eleven; suture impressed; the spire regu- 

 ularly acuminate, the upper whorls flattened; lower ones con- 

 stricfted below the suture. 



"Body whorl constridted about the center, tapering regularly 

 toward the beak; a large number of fine sinuous revolving lines 

 upon this lower part. 



"Aperture less than half the length of the shell; slit small, 

 situated at the lower part of the sutural constricftion , its outer 

 edge rising up and rounded; canal moderate, open, bent a little 

 to the right; columella with a refledled callus near the beak. 



