1887.] NATURAL SCIENCES OF PHILADELPHIA. 51 



ON INVERTEBRATES FROM THE EOCENE OF MISSISSIPPI AND 



ALABAMA. 



BY OTTO MEYER. Ph. D. 



Ill the illustrations to the following paper, the figures of some 

 insufficiently known species of the Southern Old-Tertiary are included. 

 Notes on these are given. The species referred to are mostly small 

 ones. All the mentioned material has been collected by me and is 

 in my collection. ^ 



Odostomia Boettgeri n. sp. PI. Ill fig. 4. 



Subulate, polished. Nucleus sinistral, vertical, j^artly hidden. 

 Adult whorls eight, with an impressed line below the suture. 

 Suture distinct. Mouth subelliptical. Inner lip with a strong, 

 nearly horizontal fold. At some distance from the outer lip there 

 are within six raised revolving lines. 



Vicksburg, Miss. ^^Lower Vicksburgian." 



Turbonilla major n. sp. PI. Ill fig. 3. 



Nucleus sinistral, its axis horizontal, its volutions separate. 

 Adult whorls many, subconvex, covered with strong transverse ribs 

 and densely spirally striatal. The spirals do not extend over the 

 ribs. Mouth subquadrangular. Inner lips with a strong oblique 

 fold. Base spirally striated. Jackson, Miss. Rare. 



The more common Turbonilla in Jackson is a form which I 

 should rather put to Turbonilla neglecta Mr. than to the above 

 species. Compared with T. major it is much smaller and more 

 slender and the spiral striae are scarcely distinct, otherwise it is 

 very similar. 



DENTITEREBRA n. gen. 



Turreted ; transversely ribbed. Aperture narrow, terminating in 

 a short anterior canal. Inner lip callous, very slightly striate. 

 Outer lip crenulated internally, siiious posteriorly. Base striated. 



On account of its mouth this genus is probably to be placed 

 among the Columbellidae, in which family it is conspicuous by its 

 turreted spire and transverse ribs. It is perhaps to be considered a 

 subgenus of Columbella. If this is not the right position, it may 

 belong to the Pleurotomidae. 



