FAUNA OF OETHAULAX PUGNAX ZONE. 39 



TURRIS VIBEX Dall. 



Pleurotoma (albida var.?) vibex Dall, Bull. Mus. Comp. Zool., vol. 18, No. 

 19, p. 73, 1889. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. U. S. 

 Nat. Mus. No. 166095. 



The examination of many specimens, both recent and fossil, since 

 1889, has confirmed the belief that this form is specifically distinct 

 from T. albida. It is not only much smaller and proportionately 

 much more slender than albida of the same length, but the recent 

 form has blackish spiral bands in the periostracum between the 

 spiral keels, while the yoimg of albida is uniformly yellowish-white. 



The most nearly related form is the Vicksburgian Pleurotoma 

 cochlearis of Conrad, which I regard as conspecific with T. albida. 



TURRIS (SURCULA) SERVATA Conrad. 



Plate 5, fig. 16. 



Pleurotoma servata Conrad, Journ. Acad. Nat. Sci. Phila., ser. 2, vol. 1, 

 p. 115, pi. 11, fig. 18, 1848.— Dall., Trans. Wagner Inst., vol. 3, pt. 1, p. 

 28, 1890. 



Oligocene of Vicksburg, Mississippi, and of the Tampa silex beds 

 at Ballast Point, Florida ; Dall and Post. U. S. Nat. Mus. No. 115267. 



Genus DRILLIA Gray. 



Drillia Gray, Jardine's Ann. Nat. Hist, vol. 1, p. 28, 1838. Type, D. um- 

 hilicata Gray. 



The typical Drillia is a rare African shell with a flaring um- 

 bilicus, quite different from the majority of the species commonly 

 referred to it by the authors. However, in the chaotic state of the 

 systematic arrangement of the family which exists at present, I can 

 do no more than follow the general practice. 



DRILLIA CONDOMINIA, new species. 



Plate 12, fig. 25. 



Shell of moderate size, rather thin, with an elongated, turrited 

 spire of about eight whorls, separated by a closely appressed but 

 distinct suture ; nucleus defective, subsequent whorls strongly shoul- 

 dered and sculptured; axial sculpture of (on the penultimate whorl 

 ten) rounded ribs beginning at the shoulder, on the spire reaching 

 the suture in front, and on the last whorl obsolete on the base, with 

 subsequent interspaces which become wider on the last part of the 

 last whorl; these ribs are slightly protractive; lines of growth not 

 conspicuous; spiral sculpture of (on the spire 3 to 5) revolving 



