84 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



TURBONILLA (PTYCHEULIMELLA) ETHELLINA, new species. 

 Plate 12, fig. 20. 



Shell minute, slender, smooth, with 6 or more whorls (apex decol- 

 late) regularly increasing; whorls of the spire flattened with the 

 suture wound a little in front of the periphery, giving a beveled 

 aspect to the anterior edge of the whorl ; base rounded, imperforate ; 

 aperture rounded-quadrate; pillar thin, straight (plicate?); outer 

 lip rather straight, thin, entire; anterior margin rounded. Height 

 of last five whorls 3.5 mm., maximum diameter of last whorl 1 mm. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. One 

 specimen in the Post collection, U. S. Nat. Mus. No. 165094. 



Under the microscope faint indications of axial ribs appear. The 

 aperture is filled with matrix, obscuring the plait if any exists. 



Genus ODOSTOMIA Fleming. 



ODOSTOMIA (MENESTHO) IMPRESSA Say. 



Odostomia (Menestho) impressa (Say) Baetsch, Proc. Boston Soc. Nat. 

 History, vol. 34, p. 103, pi. 13, fig. 51, 1909. 

 Tampa silex beds, one specimen; E. J. Post. U. S. Nat. Mus., 

 No. 214739. 



Though not quite mature this specimen seems to differ in no respect 

 from the recent shell. 



Family CYPKAEDAE. 



Genus CYPRAEA Linnaeus. 



Cypraea Linnaeus, Syst. Nat., ed. 10, p. 718, 1758. 



CYPRAEA TUMULUS Heilprin. 

 Plate 3, figs. 1, 12. 



Cypraea tumulus Heilprin, Trans. Wagiaer Inst.., vol. 1, p. Ill, pi. 16, figs. 



49, 49^ 1887. 

 Cypraea pingnis Conrad, in Wailes' Geol. Miss., p. 289, pi. 17, figs. 3 '^, 3 '*, 



1854 ; Proc. Acad. Nat. Sci. Phila., vol. 7, p. 262, 1855 ; not of Bonelli, 



1827. 

 Cypraea ventripotens Cossmann, Essais Pal., vol. 5, p. 161, 1903. 



Jacksonian Eocene of Creole Bluff, Grant Parish, Louisiana (L. C. 

 Johnson) ; Jackson, Mississippi (Wailes) ; Oligocene of White Beach, 

 Little Sarasota Bay, and of the Tampa silex beds at Ballast Point, 

 Tampa Bay, Florida. Its presence in the Miocene of North Caro- 

 lina is very doubtful. 



M. Cossmann proposed a new name for Conrad's species which 

 was preoccupied by Bonelli, but Heilprin's name has sixteen years' 

 priority. No name should be substituted for a preoccupied name 

 without a previous examination of the history of the species to see if 

 there is not already an available synonym. 



