THE NAUTILUS. 



VOL. XVI. JANUARY, 19O3. No. 9. 



NEW SPECIES OF TERTIARY FOSSILS FROM ALABAMA, MISSISSIPPI 



AND FLORIDA. 



BY T. II. ALDRICH. 



The following species are principally Eocene ; descriptions of two 

 species have already appeared in THE NAUTILUS and they are now 

 figured for the first time. One new species from the Oligocene of 

 Oak Grove, Fla., has been added. The Oligocene deposit of Oak 

 Grove has been pierced by a deep well near Mobile, Ala., and no 

 doubt it will be found still further to the westward. I am indebted 

 to C. W. Johnson, of the "Wagner Free Institute of Science, for 

 comparisons with types in the Academy of Natural Sciences, Phila- 

 delphia. All the drawings have been executed by Dr. J. C. McCon- 

 nel, of the Army Medical Museum, Washington, D. C. 



PLEUROTOMA (DRILLIA) CASEYI n. sp. PI. Ill, fig. 1, 2. 



Shell fusiform, whorls ten to eleven, first four smooth, apex pointed, 

 the balance of the whorls nodular with a connecting line situated at 

 the periphery. About nine nodes on each whorl. The balance of 

 the spiral sculpture consisting of close-set, rounded lines, which are 

 stronger on the lower part of each whorl ; suture nearly concealed by 

 a strongly raised and rounded band which is wavy and closely ap- 

 pressed. On the humeral area the spiral lines are cut by fine curved 

 lines formed by the former retral sinus, sinus nearly semi-circular. 

 Canal open and slightly spatulate. 



Length 11 mm., width 3 mm. 



Localities : Red Bluff, Miss., Byrams Ferry, Pearl Rv., Miss., and 

 Vicksburg, Miss. 



Resembles Drillia texanopsis Harris, but is carinated at the periph- 



