46 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



DRILLIA (CYMATOSYRINX?) SILFA, new species. 

 Plate 12, fig. 22. 



Shell small, solid, the whorls rapidly increasing in diameter, the 

 surface smooth except for axial sculpture; nucleus lost, subsequent (5) 

 whorls strongly sculptured with twelve narrow, prominent, arcuately 

 protractive ribs, continuous from the canal to the suture and so on to 

 the apex in a continuous series; lines of growth not visible, canal 

 short, smooth, slightly recurved ; aperture rather wide, body and pil- 

 lar slightly erased by the animal in process of growth. Height 7 

 mm. without the (lost) nucleus, maximum diameter 3.3 mm. 



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



One sx3ecimen in the Post collection, U. S. Nat. Mus. No. 165034. 



This specimen is obviously immature; the aperture if complete 

 would probably have the characters of the section Cymatosyrlnx, 

 but it is distinct from any of the other species yet collected from this 

 horizon. 



DRILLIA (CYMATOSYRINX) NEWMANI Dall. 



Plate 3, fig. 9 ; plate 7, fig. 3. 



DrilUa newmani Dall, Trans. Wagner Inst., vol. 3, pt. 1, p. 29, pi. 4, figs. 

 5, 5a, 1890. 

 Tampa silex beds at Ballast Point, Tampa Bay, Florida. New- 

 man. U. S. Nat. Mus. No. 112087. 



Genus MANGILIA Risso (em.). 



Mangelia (Leach Ms.) Risso, Hist. Nat. Eur. Mer., vol. 4, p. 219, 1826. First 

 species, M. costulata Risso. Murex neJ)ula Montagu. 



Mangilia Philippi, Handb. der Conch., p. 138, 1853 (after Mangili, Italian 

 naturalist.— D.\LL, Bull. Mus. Comp. Zool., vol. 43, No. 6, 1908, p. 259. 



MANGILIA ILLIOTA, new species. 

 Plate 12, fig. 15. 



Shell small, solid, acute, with about 8 whorls separated by a dis- 

 tinct but appressed suture; nucleus small, inflated, bulbous, smooth; 

 subsequent whorls strongly sculptured; axial sculpture of (on the last 

 whorl 13) narrow, rounded, nearly straight ribs, separated by wider 

 interspaces and extending from the sutural cord to the vicinity of the 

 canal with a constriction at the anal f asciole ; the interspaces behind 

 the periphery are smooth, the surface polished, and the incremental 

 lines hardly visible ; spiral sculpture of a rather strong low cord in 

 front of the suture, a constriction indicating the anal fasciole in 

 front of the cord, and in front of the periphery a dozen or more 

 feeble subequal spiral threads growing stronger toward the canal and 

 with about equal interspaces; on the back of the canal there are a 



