42 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



DRILLIA EUPORA, new species. 



Plate 5, fig. 3. 



Shell small, slender, elongate, of more than 6 flattish whorls (speci- 

 men decollate) ; suture distinct, separated from the fasciole in front 

 by an elevated spiral ridge, carinated and beveled from the carina 

 to the suture which is slightily undulated by the ribs; anal fasciole 

 excavated and spirally faintly striated, especially on the anterior 

 slope; axial sculpture of (on the last whorl) about 20 sharp low 

 straight narrow ribs, with much wider interspaces, and extending 

 from the shoulder to the canal ; spiral sculpture between the sutures 

 of 4 fine elevated threads, including 1 at the shoulder and a fifth on 

 which the suture is laid, with wider flat interspaces ; on the last whorl 

 there are 14 or 15 equal and equally spaced similar threads; aperture 

 narrow; anal sulcus wide, shallow; outer lip defective; canal long 

 and straight, rather narrow; pillar and body with a rather thick 

 smooth layer of callus. Height of five whorls 16, diameter at decol- 

 lation 2, maximum diameter behind aperture 5.75 mm. 



Tampa silex beds, at Ballast Point, Tampa Bay, Florida, one 

 specimen. U. S. Nat. Mus. No. 166099. 



This species belongs to the group of D. ostrearum Stearns and 

 resembles D. abundans Conrad, but is more slender and has sharper 

 ribs. 



DRILLIA BELOTHECA, new species. 

 Plate 4, fig. 7. 



Shell small, slender, 8-whorled, the nucleus smooth and rounded; 

 axial sculpture of 10 low narrow straight ribs with wider interspaces; 

 spiral sculpture of a prominent cord at the suture, a nearly smooth 

 more or less excavated anal fasciole, between the sutures two, and on 

 the last whorl eight or nine subequal prominent threads crossing the 

 ribs without interruption and giving the effect of a cancellated sur- 

 face; anal sulcus shallow, outer lip (fractured) a heavy callus on 

 body and pillar, canal short, straight. Height of shell 9, of last 

 whorl 5.25 ; diameter 3 mm. 



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

 specimen. IT. S. Nat. Mus. No. 166097. 



A very characteristic little species not closely related to any other 

 of this horizon. 



DRILLIA SPICA, new species, 



Plate 12, fig. 8. 



Shell small, slender, thin, acute, elongate, with about 8 whorls; 

 nucleus of 2 smooth whorls rounded above ; subsequent whorls sculp- 

 tured, suture closely appressed but without a sutural cord; axial 



