Geological Survey of Alabama. 71 



between them. All the whorls are convex ; aperture effuse anteriorly, 

 but without proper canal ; base spirally striated. Many of the specimens 

 have varices. 



Localities. Jackson, Miss., common; Red Bluff, Miss., not rare. 



The type-specimen is from Jackson ; in the specimens from Red Bluff 

 the canal is more distinct. Named after Prof. v. Koenen, who has suc- 

 cessfully worked up the German Tertiary. 



CERITHIOPSIS ALDRICHI, n. sp. PL 2, fig. 14. 



Subulate ; whorls convex ; oldest whorls covered by four spiral lines, the 

 second one from above is the smallest and last developed one ; they are 

 covered by transverse ribs, about twelve on each whorl ; the embryonic 

 whorls are numerous and rounded on the oldest of them the spiral lines 

 commence to appear, while the others are only covered by numerous 

 curved, transverse ribs. Base covered with minute elevated, revolving 

 lines, the outermost of which is larger ; canal reflected. 



Localities, Red Bluff, Miss., Jackson, Miss., Claiborne, Ala. 



CERITHIOPSIS JACKSONENSIS, n. sp. 



Whorls regularly rounded, covered by four elevated, longitudinal lines, 

 crossed by numerous transverse ribs of smaller size ; the points of crossing 

 are thickened. Base covered with minute elevated, revolving lines, the 

 outermost of which is larger ; canal reflected. 



Locality. Jackson, Miss. 



On the last whorl of the type-specimen a fifth spiral line appears near 

 the suture, and in a much larger specimen this fifth spiral is fully devel- 

 oped. Differs from the preceding species in having more rounded whorls. 



TRIFORIS SIMILIS, n. sp. PL I, figs. 8, 8a. 



Slender ; whorls flat, covered with three longitudinal lines of nodules ; 

 the middle line the smallest and apparently last developed, but on the 

 lower whorls equal in size to the other two ; mouth quadrate ; base flat- 

 tened, with a distinct impressed line along its margin ; suture very dis- 

 tinct. Length of the last five whorls, three mm. 



Loca f ity. Claiborne, Ala. 



The species is very similar to the Miocene Cerithium moniliferum, H. 

 C. Lea,* which I do not have. Besides, it resembles very much that 



*Tram. Am. Philos. Soc., IX., Second Series, 1843, p. 269, pi. 37, fig. 92; and 

 Ernmons' Rep. North Carolina Geol. Surr., p. 269, fig. 159. 



